Adjectives

410+ Adjectives That Start with O: Positive O Words To Describe Someone, with Definitions and Examples

Adjectives that Start with O

Looking for adjectives that start with O? Find below a list of over 410 adjective words that will make your speech original and outstanding! Need positive words to describe someone? You’re at the right place!

Table Of Contents:

Adjectives That Start with OA, OB (45 Words)
Adjectives That Start with OC (21 Words)
Adjectives That Start with OD (9 Words)
Adjectives That Start with OE, OF (19 Words)
Adjectives That Start with OH, OI, OK (5 Words)
Adjectives That Start with OL (23 Words)
Adjectives That Start with OM (11 Words)
Adjectives That Start with ON (33 Words)
Adjectives That Start with OO, OP (49 Words)
Adjectives That Start with OR (47 Words)
Adjectives That Start with OS (11 Words)
Adjectives That Start with OT (8 Words)
Adjectives That Start with OU (36 Words)
Adjectives That Start with OV (86 Words)
Adjectives That Start with OW, OX (8 Words)
Other Lists of Adjectives

Adjectives That Start with OA, OB (45 Words)

oafish	Ill-mannered and coarse and contemptible in behavior or appearance My fellow, oafish roomate has shared my computer with me periodically.
oaken	Consisting of or made of wood of the oak tree A new oaken enclosure was built and new wiring and electric bellows bought.
oaten	Of or related to or derived from oats In the earlier times oaten kisiel was more common.
obdurate	Showing unfeeling resistance to tender feelings Actually, there are some fairly obdurate myths about the london climate.
obedient	Dutifully complying with the commands or instructions of those in authority- He was most obedient to the elders.
obese	Excessively fat The filly is obese, so you should stop feeding her.
objectionable	Causing disapproval or protest It’s deemed to be patronising, sanctimonious and totally objectionable.
objective	Serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes The objective is not to be punitive.
oblanceolate	Having a broad rounded apex and a tapering base The leaves are obovate or oblanceolate, sometimes narrow oblanceolate.
oblate	Having the equatorial diameter greater than the polar diameter; being flattened at the poles M19 is the most oblate of the known globular clusters.
obligate	Restricted to a particular condition of life In amphibians it can be obligate or facultative.
obligated	Caused by law or conscience to follow a certain course He is not obligated to reply in the slightest.
obligational	Relating or constituting or qualified to create a legal or financial obligation
obligatory	Required by obligation or compulsion or convention Whether an act is supererogatory, or obligatory, can be debated.
obliging	Showing a cheerful willingness to do favors for others Your enhanced opinion and obliging moderation is noted.
oblique	Slanting or inclined in direction or course or position–neither parallel nor perpendicular nor right-angled The opening or mouth of the pitcher is ovate and oblique.
oblique-angled	Having oblique angles The angled rafters and eaves of the roof stones conveys linear expansion.
obliterable	Able to be obliterated completely
obliterate	Reduced to nothingness The people obliterate the temple of baal.
obliterated	Reduced to nothingness It is unconscionable to obliterate that fact from ‘the boere’s history.
oblivious	Failing to keep in mind Brava is oblivious to the knocking.
oblong	Deviating from a square or circle or sphere by being elongated in one direction The oblong leaves appear at the base of the plant.
obnoxious	Causing disapproval or protest He’s just being obnoxious and histrionic.
obovate	Egg-shaped with the narrower end at the base Each leaf consists of three obovate leaflets with serrate leaf margins.
obscene	Offensive to the mind The humor is politely and subliminally obscene.
obscure	Not drawing attention The etymology of the name is obscure.
obsequious	Attentive in an ingratiating or servile manner They could be better and less obsequious.
observable	Capable of being seen or noticed Behaviorism focuses only on the objectively observable aspects of learning.
observant	Paying close attention especially to details Pandora is probably the most observant and intelligent of the borgias.
observational	Relying on observation or experiment The design of an experiment or observational study often influences the power.
observing	Quick to notice; showing quick and keen perception The family raised the children observing jewish holidays.
obsessional	Characterized by or constituting an obsession Your interest in this man appears to be verging on obsessional.
obsessive	Characterized by or constituting an obsession The obsessive need to control everything and everyone.
obsolescent	Becoming obsolete The first abdominal segment has a yellow band which is sometimes obsolescent.
obsolete	No longer in use Regardless of the author, the book is obsolete.
obstetric	Of or relating to or used in or practicing obstetrics Her work transformed obstetric anaesthesia.
obstetrical	Of or relating to or used in or practicing obstetrics This may lead to a life threatening obstetrical emergency.
obstinate	Resistant to guidance or discipline The most obstinate farmers were persecuted and imprisoned.
obstreperous	Noisily and stubbornly defiant He is far from hyperventilating, obstreperous or belligerent.
obstructed	Shut off to passage or view or hindered from action The rain bearing wind gets obstructed by the hills and brings heavy downpour.
obstructive	Preventing movement First, that the influence of the home is obstructive.
obtainable	Capable of being obtained The augmented chord is obtainable by only using all the degrees.
obtrusive	Undesirably noticeable However, most people have less obtrusive floaters, like the ones in the image.
obtuse	Rounded at the apex The focus of this list is too obtuse.
obvious	Easily perceived by the senses or grasped by the mind It is too obvious to belabor.

Adjectives That Start with OC (21 Words)

occasional	Occurring from time to time I suffer from occasional choleric imbalances.
occidental	Denoting or characteristic of countries of europe and the western hemisphere I want to learn about the occidental culture.
occipital	Of or relating to the occiput Internal occipital protuberance.
occluded	Closed off This is known as an occluded front.
occlusive	Tending to occlude Protopic should not be used with occlusive dressings .
occult	Having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding She also became interested in science, mesmerism, and the occult.
occupational	Of or relating to the activity or business for which you are trained I was about to make an occupational decision.
occupied	Having ones attention or mind or energy engaged He was engaged in the organizational activities in the occupied taganrog.
occurrent	Presently occurring (either causally or incidentally) Also known as occurrent, accident or happening.
oceangoing	Used on the high seas Mobile stations are typically large oceangoing vessels,.
oceanic	Resembling the ocean in apparent limitlessness in extent or degree Ophiolites and oceanic lithosphere.
ocellated	Having ocelli Only the wet season ocellated form of this species has been recorded.
ocher	Of a moderate orange-yellow color Young men cover their bodies in ocher to enhance their appearance.
ochre	Of a moderate orange-yellow color Its also known as the ‘ochre threadtail’.
octagonal	Of or relating to or shaped like an octagon It is an octagonal building flanked by four octagonal pillars.
octal	Of or pertaining to a number system having 8 as its base An interesting feature of the language is its use of octal numbers.
octangular	Of or relating to or shaped like an octagon
octogenarian	Being from 80 to 89 years old At that time she was an octogenarian.
octosyllabic	Having or characterized by or consisting of eight syllables Its stanza is made of four octosyllabic lines.
octuple	Having eight units or components However octuple sculls are not used in main competitions.
ocular	Visible- shakespeare Someone else will point out the ocular disturbance to the patient.

Adjectives That Start with OD (9 Words)

odd	Of the remaining member of a pair, of socks e.g. His odd hobby is to smelt anything metal.
oddest	Not divisible by two The phrasing in the previous version was odd.
oddish	Somewhat strange Good articles have always been a bit oddish.
odds-on	Having a better than even chance of success Unfortunately, the odds are in favor of the former.
odious	Unequivocally detestable- edmund burke Lists are usually especially odious in the eyes of deletionists.
odoriferous	Morally offensive I, however, prefer the usage of odoriferous as it empirically objective.
odorless	Having no odor It is trackless and virtually odorless.
odorous	Having odor or a characteristic odor It should be free from colored, fluorescing, and odorous compounds.
odourless	Having no odor Namely, the chemical compound is not toxic as such and it is odourless.

Adjectives That Start with OE, OF (19 Words)

oecumenic	Concerned with promoting unity among churches or religions
oecumenical	Of worldwide scope or applicability- christopher morley
off	Not performing or scheduled for duties Parts of the colony can break off and clog the fuel lines and fuel filters.
off-beat	Informal terms; strikingly unconventional Zito is known for his idiosyncrasies and his offbeat personality.
off-limits	Barred to a designated group It demarcated the limits.
off-line	Not on a regular route of a transportation system The line of reasoning is the apostate line of reasoning.
offbeat	Informal terms; strikingly unconventional There isn’t anything mentioned in the article about this offbeat in bluegrass.
offenceless	Incapable of offending or attacking
offenseless	Incapable of offending or attacking In other words, the chanting of the holy name makes one offenseless.
offensive	Morally offensive She felt offensive to hear such scabrous news.
offhand	With little or no preparation or forethought I couldn’t tell you who the writers of the fact files were, offhand.
offhanded	With little or no preparation or forethought As a swede i take offence at this arrogant offhanded discussion.
official	Given official status as a national or state institution Elias is the official statistician of mlb and hence the official source.
officious	Intrusive in a meddling or offensive manner They tend to be rather officious and sticklers for rules.
offish	Lacking cordiality; unfriendly I’d actually be interested, in a stand offish way to see how this pans out.
offshore	At some distance from the shore The waves break further offshore and therefore reduce their erosive power.
offside	Illegally beyond a prescribed line or area or ahead of the ball or puck The new offside line became the hindmost foot of the scrum.
offsides	Illegally beyond a prescribed line or area or ahead of the ball or puck On the first play, nebraska committed a five yard offsides penalty.
offstage	Situated or taking place in the area of a stage not visible to the audience The sound of running water is heard offstage and owen enters.

Adjectives That Start with OH, OI, OK (5 Words)

ohmic	Of or relating to or measured in ohms At the time, a major challenge was ohmic metal contact formation.
oil-bearing	Containing oil Bearing guides and steps may be used in aligning the bearing in the retainer.
oily	Unpleasantly and excessively suave or ingratiating in manner or speech; It is a pale yellow oily liquid.
ok	Being satisfactory or in satisfactory condition But that’s ok if we can disjoin them now.
okay	Being satisfactory or in satisfactory condition Okay discuss on the talkpage the graphs.

Adjectives That Start with OL (23 Words)

old	Very familiar (used for emphasis)old (adj) skilled through long experience I must be getting harebrained in my old age.
old-fashioned	Out of fashion We knew him as washie, short for the old fashioned washpeg that his peers at school in south africa said that the gangling youth resembled.
old-line	Adhering to conservative or reactionary principles The symbols are old ideograms.
old-maidish	Primly fastidious She is seventy years old.
old-time	Attractively old-fashioned (but not necessarily authentic) He was 64 years old and in frail health at the time.
old-womanish	Primly fastidious The old man sniffled.
olden	Long past In the olden days it was celebrated in a grand scale.
older	Belonging to some prior time Ren woxing dies later after suffering from giddiness due to old age.
oldest	Belonging to some prior time Lucky debonair died of old age in 1987 at age twenty five.
oldish	Somewhat elderly He is royalty and talking in a rather oldish and dramatic style.
oldline	Adhering to conservative or reactionary principles
oleaceous	Of or pertaining to or characteristic of trees or shrubs of the olive family
oleaginous	Containing an unusual amount of grease or oil There is disclosed a process for the sequential extraction of carbohydrates and oil from particulate oleaginous seed materials utilizing aqueous alcohols as the solvent to produce a novel protein concentrate.
oleophilic	Having a strong affinity for oils rather than water The oleophilic resin can be silicone, urethane, epoxy.
oleophobic	Lacking affinity for oils Fluorocarbons are also lipophobic and oleophobic.
olfactive	Of or relating to olfaction
olfactory	Of or relating to olfaction The olfactory tubercle is a structure involved in olfaction.
oligarchic	Of or relating to or supporting or characteristic of an oligarchy All of which goes to prove that an internationalist europe is an oligarchic idea designed to protect the interests of an extremely arrogant ruling class which has taken over the reins of power in europe and is pursuing policies that show contempt for people’s interests.
oligarchical	Of or relating to or supporting or characteristic of an oligarchy Aristotle viewed this model as an oligarchical anathema.
olive	Of a yellow-green color similar to that of an unripe olive Olive groves are also plentiful although many are uncultivated and overgrown.
olivelike	Resembling an olive
olympian	Of or pertaining to the greater gods of ancient greece whose abode was mount olympus Olympian marcus nash will teach an intermediate to advanced skate skiing clinic saturday at royal gorge.
olympic	Of or relating to the olympic games She is an olympic level javelin thrower with unerring aim.

Adjectives That Start with OM (11 Words)

omani	Of or relating to oman or its people Things related to the omani city of salalah.
ominous	Threatening or foreshadowing evil or tragic developments The ending of the article seems a bit ominous.
omissible	Capable of being left out A more important problem to be pursued is how to deal with omissible elements.
omissive	Characterized by omissions
omnibus	Providing for many things at once There was also one omnibus route there.
omnidirectional	Not directional They may be directional or omnidirectional.
omnifarious	Of all varieties or forms or kinds
omnipotent	Having unlimited power In the other sense, god is said to be omnipotent.
omnipresent	Being present everywhere at once God is omnipresent.
omniscient	Infinitely wise It gives the impression of being written by an omniscient author.
omnivorous	Feeding on both plants and animals It is practically omnivorous, and feeds on animal and vegetal detritus.

Adjectives That Start with ON (33 Words)

on	Planned or scheduled The poor sleep on mats on the floor.
on-and-off	Not in operation or operational Parts of the colony can break off and clog the fuel lines and fuel filters.
on-going	Currently happening I going to reassert these figures on the article.
on-line	On a regular route of a railroad or bus or airline system Hawaii’s martin amp; macarthur redesigns its online store.
on-site	Taking place or located at the site Cactuses grow on the southern edge of the site.
oncologic	Of or relating to or practicing oncology The device can be used as an adjunctive therapy to other oncologic treatments.
oncological	Of or relating to or practicing oncology It is used most often in oncological surgery.
oncoming	Moving toward one The car ran straight into the path of an oncoming lorry.
one	Used informally as an intensifier But not a single one passed the eidetic memory test.
one-by-one	Used of a single unit or thing; not two or more As only one person or hypostasis some argued that he would have only one will.
one-horse	Small and remote and insignificant A horse scraper is used to remove the sweat from the coat of the horse.
one-man	Designed for or restricted to a single person The bacchanalian man was not the one who committed the crime.
one-on-one	Of the same kind or quality One who shall single handedly munch all the cookies in the world
one-party	Determined by a single party The compatriot party is a political party in azerbaijan and kazakhstan.
one-sided	Favoring one person or side over another His article at the moment is very one sided and uncritical.
one-time	Belonging to some prior time It was one of the most sophisticated houses of the time.
one-way	Moving or permitting movement in one direction only You rebuffed, in your inimitable way, every one of those attempts.
one-woman	Designed for or restricted to a single person One woman had a denture, and there is also evidence for trepanations.
one-year	Completing its life cycle within a year Us house speaker offers to shelve debt limit for one year.
oneiric	Of or relating to or suggestive of dreams
onerous	Not easily borne; wearing In the end, the economy faltered and taxation became more onerous.
onetime	Belonging to some prior time The scholarship is available on a competitive basis and is a onetime award.
ongoing	Currently happening The study and the practice are ongoing.
online	Connected to a computer network or accessible by computer The inventory of the archive is available online.
only	Exclusive of anyone or anything else As only one person or hypostasis some argued that he would have only one will.
onomastic	Of or related to onomastics There is an even bigger area from toponymic and onomastic evidence.
onomatopoeical	Formed in imitation of a natural sound- harry hoijer
onshore	On the edge of the land It was sent for later examination onshore.
onside	Not offside; being within the prescribed area of play Andy reid then tried an onside kick.
onstage	Situated or taking place on the area of a stage visible to the audience He once played a baboon onstage.
ontogenetic	Of or relating to the origin and development of individual organisms Ontogenetic realization of categorization.
ontological	Of or relating to ontology Ontological questions are answered by looking in the ontological database only.
onymous	Bearing a name Syn onymous expressions are very useful in a number of nlp applications.

Adjectives That Start with OO, OP (49 Words)

oozy	Leaking out slowly Ben rayer of the toronto star felt that the song had a oozy slow jam .
opalescent	Having a play of lustrous rainbow colors An old man in opalescent robes will be waiting for you on a dias in the center.
opaline	Having a play of lustrous rainbow colors These skeletons are composed of opaline silica.
opaque	Not clearly understood or expressed The shell is opaque and shining.
open	Accessible to all Let’s not open the door to infinite indemnity regarding the past.
open-air	In the open air Respirators either purify the air or they give you a supply of fresh air.
open-ended	Without fixed limits or restrictions The diver is an open pool ended object in an airtight container of water.
open-eyed	Carefully observant or attentive; on the lookout for possible danger In the kingdom of the blind the one eyed man is king.
open-minded	Ready to entertain new ideas He’s the most athletically minded of the kings.
opencast	Worked from the exposed surface All the deep coal mines are now closed, but opencast continues.
opencut	Worked from the exposed surface Mining continued opencut on the face of the mountain, and underground.
opened	Not sealed or having been unsealed The distillery was opened to the public.
openhanded	Given or giving freely The hand can made into a fist making it a backfist or done openhanded as a slap.
openhearted	Showing or motivated by sympathy and understanding and generosity In spite of this xiangyun is openhearted and cheerful.
opening	First or beginning The opening hours are infrequent.
openmouthed	With eyes or mouth open in surprise The rest of the string section sat openmouthed at how well he could play.
operable	Fit or ready for use or service The bucket is also operable as a clamshell.
operant	Having influence or producing an effect Eeg operant conditioning in intractable epileptics.
operatic	Of or relating to or characteristic of opera Operatic debut and professional career.
operating	Being in effect or operation- leslie marmon silko The partnership can afterwards deduct the payment as operating costs.
operational	Fit or ready for use or service The following thursday saw the culmination of the operational sea training.
operationalist	Of or relating to or espousing operationalism
operative	Performing or capable of performing The only operative provisions related to the reform of the provinces.
operculate	Having an operculum They are terrestrial operculate gastropod mollusks in the order helicinoidea.
operculated	Having an operculum He determined the true nature of the operculated coral.
operose	Characterized by effort to the point of exhaustion; especially physical effort A citation to this effect would seem more than a trifle operose.
ophthalmic	Of or relating to ophthalmology It is available as ophthalmic solution.
opinionated	Obstinate in your opinions He could be tactless, impatient, argumentative and opinionated.
opinionative	Obstinate in your opinions I understand what you mean, but i think its all opinionative.
opisthognathous	Having receding jaws
opponent	Characterized by active hostility He was a vociferous opponent of the oxford movement.
opportune	Suitable or at a time that is suitable or advantageous especially for a particular purpose The mantram is to be used frequently throughout the day, at opportune moments.
opportunist	Taking immediate advantage, often unethically, of any circumstance of possible benefit Spader is creepily effective as the ladder climbing opportunist.
opportunistic	Taking immediate advantage, often unethically, of any circumstance of possible benefit It is an omnivorous and opportunistic forager and feeder.
opposable	Capable of being placed opposite to something The thumb is not truly opposable, but the first toe is.
opposed	Being in opposition or having an opponent The majority opposed the merger.
opposing	Characterized by active hostility The king made efforts to harmonize the opposing parties.
opposite	The other one of a complementary pair That’s the opposite of tendentious.
oppositive	Expressing antithesis or opposition I take the oppositive approach to shroeder and beyerstein.
oppressive	Marked by unjust severity or arbitrary behavior The lakes and waterways make the atmosphere damp and oppressive.
opprobrious	Deserving or bringing disgrace or shame- rachel carson The phrase is intended to be opprobrious, rather than laudatory.
optative	Relating to a mood of verbs in some languages Among these are an optative and an antipassive.
optic	Of or relating to or resembling the eye Optic ataxia is the impairment of visually guided reaching.
optical	Of or relating to or involving light or optics The optical dot gain is the perimeter of the points.
optimal	Most desirable possible under a restriction expressed or implied Reexamination of optimal quantum state estimation of pure states.
optimistic	Expecting the best in this best of all possible worlds Also, genius, the word sanguine means cheerfully optimistic.
optimum	Most desirable possible under a restriction expressed or implied Let’s put the case for the optimum layout.
optional	Possible but not necessary; left to personal choice Even in tiff and jpeg, the cm tags are optional.
opulent	Rich and superior in quality He is saying the ashram was opulent.

Adjectives That Start with OR (47 Words)

oracular	Of or relating to an oracle In chinese traditional religion, the tortoise is an oracular animal.
oral	Of or relating to or affecting or for use in the mouth Oral sex is the term given to genital stimulation by the mouth.
orange	Of the color between red and yellow; similar to the color of a ripe orange I found the orange sherbet in the fridge.
orangish	Of the color between red and yellow; similar to the color of a ripe orange The contrast of the bluish glass and orangish fish is really nice.
oratorical	Characteristic of an orator or oratory- robert graves Buffet had some oratorical talent, but shone most in opposition.
orbicular	Having the shape of a sphere or ball- zane grey The pitcher mouth is horizontal and orbicular.
orbiculate	Circular or nearly circular The pitcher lid or operculum is sub orbiculate and has no appendages.
orbital	Of or relating to an orbit Endeavour delivered the expedition four crew to the orbital outpost.
orbitual	Describing a circle; moving in a circle
orchestral	Relating to or composed for an orchestra Perhaps the desideratum is the early orchestral sketch ‘kinder scout’.
ordained	Invested with ministerial or priestly functions In 1961, he was ordained bishop of palmyra, in central syria.
ordered	Disposed or placed in a particular kind of order He was ordered to amass the objects in array.
orderly	Devoid of violence or disruption The atmosphere is fresh and clean the environment is peaceful and orderly.
ordinal	Of or relating to a taxonomic order This ordinal is relative to the complexity of the task or problem.
ordinary	Not exceptional in any way especially in quality or ability or size or degree Feelings are qualia and therefore not communicable by ordinary language.
organic	Simple and healthful and close to nature In organic production, sulfur is the most important fungicide.
organicistic	Relating to or tending toward organicism
organisational	Of or relating to an organization The first step is to determine the organizational structure.
organised	Being a member of or formed into a labor union The work is organized according to workers.
organismal	Of or relating to or belonging to an organism (considered as a whole) I’m also helping to sort stub articles in organismal biology and ecology.
organismic	Of or relating to or belonging to an organism (considered as a whole) Mcgraw hill series in organismic biology’.
organizational	Of or relating to an organization The organizational positions of the central groups varied.
organized	Being a member of or formed into a labor union The content of the subsections is alphabetically organized.
orgiastic	Used of riotously drunken merrymaking Philopator was devoted to orgiastic religions and to literature.
oriental	Denoting or characteristic of countries of asia The architecture of the building is mixed baroque and oriental.
orientated	Adjusted or located in relation to surroundings or circumstances; sometimes used in combination The mode of teaching in the college is application oriented.
orientating	Positioning with respect to a reference system or determining your bearings physically or intellectually An automatic bowling machine is provided with means adapted to maintain the distributor belt closer than otherwise to the orientating pan.
oriented	Adjusted or located in relation to surroundings or circumstances; sometimes used in combination Calisthenics is primarily oriented towards young girls.
original	Not secondhand or by way of something intermediary Japanese is the original and the original takes precedence.
originative	Containing seeds of later development
ornamental	Serving an esthetic rather than a useful purpose It was an ornamental fountain.
ornate	Marked by elaborate rhetoric and elaborated with decorative details-john milton The hat and ornate buttons are part of the official wardrobe.
ornery	Having a difficult and contrary disposition- dorothy sayers Some people are just ornery.
ornithological	Of or relating to ornithology The main focus of his ornithological research was the zebra finch.
oropharyngeal	Of or relating to or located near the oropharynx Fusobacteria are normal inhabitants of the oropharyngeal flora.
orotund	Full and rich
orphic	Having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding I can tell you of the orphic mysteries, the pythagorean ones, and dionysian.
orthodox	Adhering to what is commonly accepted The church is the seat of the local orthodox bishopric.
orthogonal	Not pertinent to the matter under consideration Evolution is orthogonal to the origin of the common ancestors.
orthomolecular	Designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals Now treating pellagra with vitamin b is orthomolecular
orthopaedic	Of or relating to orthopedics The journal of orthopaedic audit.
orthopedic	Of or relating to orthopedics Stromeyer was a pioneer in orthopedics and orthopedic surgery.
orthopedical	Of or relating to orthopedics
orthoptic	Of or relating to normal binocular vision The orthoptic is the isoptic whose given angle is a right angle.
orthostatic	Pertaining to an upright standing posture Orthostatic vital signs are often used as a indicator of hypovolemia.
orthotropous	Completely straight with the micropyle at the apex
orwellian	Of or relating to the works of george orwell (especially his picture of a future totalitarian state) And no one wants an orwellian definition.

Adjectives That Start with OS (11 Words)

oscine	Of or relating to the songbirds
oscitant	Showing lack of attention or boredom
osseous	Composed of or containing bone There are two types of osseous tissue, compact and spongy.
ossicular	Pertaining to the ossicles in the middle ear The sound is not amplified uniformly across the ossicular chain.
ossiculate	Pertaining to the ossicles in the middle ear
ossiferous	Containing bones (especially fossil bones)
ossified	Set in a rigidly conventional pattern of behavior, habits, or beliefs They possess heavily ossified gastralia and dorsal osteoderms.
osteal	Relating to bone or to the skeleton
ostensible	Appearing as such but not necessarily so She’s the ostensible bad girl who works in a clam shack.
ostensive	Represented or appearing as such; pretended The ostensive reason for the complaint is that intrade has been offering off exchange options.
ostentatious	Intended to attract notice and impress others His clothes are cumbersome and ostentatious.

Adjectives That Start with OT (8 Words)

otc	Not traded on a stock exchange Accounting for otc weather derivatives as a hedge.
other	Not the same one or ones already mentioned or implied- the white queen The other is the life of the person.
otherwise	Other than as supposed or expected It’s quite the understatement otherwise.
otherworldly	Existing outside of or not in accordance with nature-aldous huxley War erupted between the midkemians and the otherworldly tsurani.
otic	Of or relating to near the ear The back edge of the head held a prominent otic notch behind each eye.
otiose	Producing no result or effect Somehow, everything otiose takes on a colourful lilt, and all’s well, whatever.
ototoxic	Toxic to the organs of hearing or balance or to the auditory nerve Salicylic acid has an ototoxic effect by inhibiting prestin.
ottoman	Of or relating to the ottoman empire or its people or its culture He was married to the sister of the ottoman banker in amman.

Adjectives That Start with OU (36 Words)

out	Not worth considering as a possibility The pigments are home to the chlorophyll which carry out photosynthesis.
out-and-out	No longer fashionable She attempts to seduce and cajole oliver out of the tape and away from hope.
out-of-the-way	Remote from populous or much-traveled regions He shoves the cops out of the way and pounds downstairs.
outback	Inaccessible and sparsely populated; He accepts, and the whole family moves to the outback.
outboard	Located away from the midline of a vessel or aircraft Infrasonic has a wide range of outboard gear and plug in effects.
outbound	That is going out or leaving There is a payphone located on the outbound platform.
outbred	Bred of parents not closely related; having parents of different classes or tribes They are an outbred strain that has an intact thymus and normal immune system.
outcast	Excluded from a society The community was regarded as outcast, impure and untouchable.
outcaste	Not belonging to or having been expelled from a caste and thus having no place or status in society Chandala here means outcaste due to their defying nature.
outclassed	Decisively surpassed by something else so as to appear to be of a lower class Albatrosses have it outclassed in the wingspan stakes too.
outdated	Old; no longer valid or fashionable The interior of the farmhouse seems to be outdated.
outdoor	Located, suited for, or taking place in the open air The breed makes the ideal outdoor companion.
outdoorsy	Characteristic of or suitable to outdoor life Hugo is described as the outdoorsy type with the physique and tan to prove it .
outer	Being on the outside or further from a center The outer surface is visualized as an oblate spheroid.
outermost	Situated at the farthest possible point from a center The outermost surfaces of the panel are plane.
outflowing	That is flowing outward The average quantity of outflowing air is measured.
outgoing	Leaving a place or a position Palmer was a guarantor of the outgoing stephen’s safety.
outlandish	Conspicuously or grossly unconventional or unusual The more outlandish the claim, the harder it is to disprove.
outlaw	Contrary to or forbidden by law The song tells the story of the outlaw couple bonnie and clyde.
outlawed	Contrary to or forbidden by law The congress wished to outlaw the cpusa in the communist control act of 1954.
outlying	Relatively far from a center or middle It is one of the most populous of the outlying regions of the metro area.
outmoded	Out of fashion I do think the usage described in this article is outmoded.
outmost	Situated at the farthest possible point from a center To einberg, service on corporate boards was of the outmost importance.
outraged	Angered at something unjust or wrong His comments outraged the establishment and the general protestant community.
outrageous	Grossly offensive to decency or morality; causing horror It’s lewd, lascivious, salacious, outrageous
outre	Conspicuously or grossly unconventional or unusual Outre philosophy never overrides mainstream science.
outrigged	Rigged with a structure projecting from or over the side of a boat for various purposes; to prevent capsizing or to support an oarlock or to help secure a mast etc
outright	Without reservation or exception You won outright and deservedly.
outside	Leading to or from the outside Mort is forced to stow away on the outside of the plane.
outsize	Larger than normal for its kind The section as it stands now looks fine to me, neither outsize nor pov.
outsized	Larger than normal for its kind Brown has always had an outsized ambition, and now she is imprisoned by it.
outspoken	Characterized by directness in manner or speech; without subtlety or evasion He is popular for his outspoken ultramontane views.
outspread	Fully extended in width It is topped by a silver eagle, wings outspread, standing on a world globe.
outstanding	Having a quality that thrusts itself into attention Stinchcomb was perhaps the outstanding star of the squad.
outstretched	Fully extended especially in length The eagle’s wings are outstretched and its head is turned to its right.
outward	That is going out or leaving As the drum rotates, centrifugal force pushes the flails outward.

Adjectives That Start with OV (86 Words)

oval	Rounded like an egg The adult carapace is wrinkled and oval shaped.
ovarian	Of or involving the ovaries Unintended oophorectomy and premature ovarian failure.
ovate	Of a leaf shape; egg-shaped with the broader end at the base The aperture is small and ovate.
over	Having come or been brought to a conclusion He completed over 20 other wordless novels in his career.
over-the-counter	Indicating opposition or resistance He was responsible for counter sabotage and counterespionage.
overabundant	Excessively abundant The overabundant and unreliable list of post grunge bands article was deleted.
overactive	More active than normal Hyperkinesis is a state of overactive restlessness in children.
overage	Too old to be useful- anthony trollope This fee for the extra minutes is called overage fees or overage charges.
overaged	Too old to be useful- anthony trollope The alloy is solution treated and overaged to provide a suitable precipitate.
overall	Including everything Consider the overall welfare of the project
overambitious	Excessively ambitious The ace project was overambitious.
overanxious	Anxious or nervous to an excessive degree I think i got a bit overanxious here.
overarm	With hand brought forward and down from above shoulder level An occasional bowler of lobs, he sometimes switched to quick overarm deliveries.
overbearing	Having or showing arrogant superiority to and disdain of those one views as unworthy In the process, she also learns edna’s overbearing ways.
overblown	Puffed up with vanity- newsweek It’s gone from underweight to, arguably, overblown in a few months.
overbold	Improperly forward or bold I also used overbold language in response to one of your posts over there.
overburdened	Heavily burdened with work or cares The article will not be overburdened.
overbusy	Too busy
overcareful	Excessively or unduly careful
overcast	Filled or abounding with clouds The sky was overcast and misty and it was very cold.
overcautious	Unnecessarily cautious And better overcautious with references than not cautious enough.
overconfident	Marked by excessive confidence She has the tendency to be overconfident in her powers.
overcredulous	Too credulous for your own good
overcritical	Inclined to judge too severely I apologize for becoming overcritical of your effort.
overcurious	Showing excessive curiosity
overdelicate	Extremely delicate
overdressed	Dressed too elaborately The jacket and tie is very easy to set aside if you feel overdressed.
overdue	Past due; not paid at the scheduled time By the 1950s, the building was mostly vacant and overdue for rehabilitation.
overeager	Excessively eager It all comes across to me as an overeager book report.
overemotional	Excessively or abnormally emotional It is the overemotional and man crazy men who have messed up american history.
overenthusiastic	Unduly enthusiastic He was overenthusiastic and he jumped the gun.
overexcited	Unduly excited Overexcited quick hands please chill out.
overfamiliar	Taking undue liberties
overfed	Too well nourished Overfed fish can sometimes be recognized by feces trailing from their cloaca.
overfond	Excessively fond
overfull	Exceeding demand The parent category isn’t overfull.
overgenerous	Very generous I think in all honesty that the b rating is overgenerous.
overgreedy	Excessively gluttonous
overgrown	Covered with growing plants Over time, the grove became overgrown and the spring became fetid.
overhand	With hand brought forward and down from above shoulder level The double overhand knot is the opened equivalent of the cinquefoil knot.
overhanded	With hand brought forward and down from above shoulder level Darts may be thrown overhanded, underhanded or both depending on league rules.
overhasty	Done with very great haste and without due deliberation- shakespeare- arthur geddes He declared, that, if he should be overhasty, he would most assuredly ruin every thing.
overhead	Located or originating from above The white flag fluttered overhead.
overheated	Heated beyond a safe or desirable point The overheated description of the commercial itself is also rubbish.
overindulgent	Excessively indulgent Massie’s overindulgent and also very wealthy parents.
overjealous	Suspicious or unduly suspicious or fearful of being displaced by a rival I have had my mention an copyright free picture deleted by an overjealous user.
overjoyed	Extremely joyful Prithviraj was overjoyed on getting this letter.
overladen	Loaded past capacity An article should not be overladen with images.
overland	Traveling or passing over land It eliminated the need for overland travel.
overlarge	Excessively large It was split out simply to reduce the size of this overlarge article.
overlying	Placed on or over something else It’s the overlying theme, after all.
overmodest	Affectedly modest or shy especially in a playful or provocative way It’s not uncommon for academic biographies to be overmodest and insufficient.
overmuch	Very great in quantity; overabundant I don’t really care overmuch about that.
overnice	Excessively fastidious and easily disgusted
overnight	Lasting, open, or operating through the whole night The rush ended the depression overnight for seattle.
overpriced	Too costly for the value The bid was felt by many to be overpriced.
overprotective	Overly protective My boy here’s a little overprotective.
overproud	Excessively proud
overrefined	Excessively delicate or refined
overripe	Too ripe and beginning to turn soft It seems like the irony is getting a little overripe.
oversea	Being or passing over or across the sea Most of the oversea businesses are automobile trading.
overseas	Being or passing over or across the sea The success of the three clubs took the business overseas.
oversensitive	Unduly sensitive or thin-skinned Perhaps i am a bit oversensitive.
overserious	Excessively serious
oversewn	Sewn together with overhand stitches (close vertical stitches that pass over and draw the two edges together)
oversexed	Having excessive sexual desire or appeal Grandma is an oversexed man chaser who falls head over heels for the olf.
overshot	Having an upper part projecting beyond the lower There was an internal overshot wheel.
oversize	Larger than normal for its kind The oversize images should be rectified.
oversized	Larger than normal for its kind The article is indeed oversized and badly organised.
oversolicitous	Excessively solicitous
overstrung	Too tightly strung
overstuffed	Upholstered thickly and deeply Home furnishing was not necessarily ornate or overstuffed.
oversubscribed	Sold in excess of available supply especially season tickets The initial stock placement was heavily oversubscribed.
oversuspicious	Unduly suspicious I’m at a loss, and probably oversuspicious.
overt	Open and observable; not secret or hidden Your overt hostility is unwarranted and unappreciated.
overvaliant	Having or showing undue valor or boldness
overweening	Presumptuously arrogant- s.v.benet- ny times What might seem like overweening ambition is actually a patriotic chore.
overweight	Usually describes a large person who is fat but has a large frame to carry it For instance, the people in the strips were often overweight.
overwhelming	So strong as to be irresistible That was the overwhelming vibe.
overwrought	Deeply agitated especially from emotion I think some of the indignation displayed by others was overwrought.
overzealous	Marked by excessive enthusiasm for and intense devotion to a cause or idea Perhaps you are just overzealous.
oviform	Rounded like an egg
ovine	Of or pertaining to or of the nature of or characteristic of a sheep or sheep It has polar fimbriae and is the causative agent of ovine foot rot.
oviparous	Egg-laying Most of these species are oviparous.
ovoid	Rounded like an egg The olives are of medium weight, ovoid shape and asymmetrical.
ovoviviparous	Producing living young from eggs that hatch within the body Fish in the subfamily anablepinae are ovoviviparous.

Adjectives That Start with OW, OX (8 Words)

owing	Owed as a debt Owing to the unusually heavy downpour many tunnels had overflowed.
owlish	Resembling an owl; solemn and wise in appearance This is just owlish showing off.
own	Belonging to or on behalf of a specified person (especially yourself); preceded by a possessive He is able to hold his own in conversation with the wily smaug.
owned	Having an owner; often used in combination Time was, the old serf owned nothing.
ownerless	Having no owner The team was essentially ownerless, being owned by the league.
oxidative	Taking place in the presence of oxygen The strong oxidative effect leads to necrosis of the mucous membrane.
oxidised	Combined with or having undergone a chemical reaction with oxygen The iron oxidised to form hematite.
oxidizable	Capable of undergoing a chemical reaction with oxygen It is thus possible to oxidize all the residual oxidizable material.

We hope our list of O adjectives will be helpful. Remember to use adjectives in your writing or speech to express your thoughts clearly and impress your listeners or readers.