IRRATIONAL: Synonyms and Related Words. What is Another Word for IRRATIONAL?

Need another word that means the same as “irrational”? Find 8 synonyms and 30 related words for “irrational” in this overview.

The synonyms of “Irrational” are: unreasonable, illogical, groundless, baseless, unfounded, unjustifiable, unsound, irrational number

Irrational as a Noun

Definitions of "Irrational" as a noun

According to the Oxford Dictionary of English, “irrational” as a noun can have the following definitions:

• A real number that cannot be expressed as a rational number.
• An irrational number or quantity; a surd.

Synonyms of "Irrational" as a noun (1 Word)

irrational number

A real number that cannot be expressed as a rational number.

Irrational as an Adjective

Definitions of "Irrational" as an adjective

According to the Oxford Dictionary of English, “irrational” as an adjective can have the following definitions:

• Not logical or reasonable.
• Not consistent with or using reason.
• Not endowed with the power of reason.
• (of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and non-recurring expansion when expressed as a decimal. Examples of irrational numbers are the number π and the square root of 2.
• Real but not expressible as the quotient of two integers.

Synonyms of "Irrational" as an adjective (7 Words)

baseless	Without foundation in fact. Baseless allegations.
groundless	Not based on any good reason. The allegations proved groundless.
illogical	Lacking in correct logical relation. An illogical fear of the supernatural.
unfounded	Having no foundation or basis in fact. Her fear that she had cancer was unfounded.
unjustifiable	Not able to be shown to be right or reasonable. An unjustifiable restriction on their freedom.
unreasonable	Beyond the limits of acceptability or fairness. She knew she was being unreasonable but she resented his domesticity.
unsound	Physically unsound or diseased. This line of argument is unsound.

Usage Examples of "Irrational" as an adjective

• Irrational animals.
• Irrational fears.
• Irrational numbers.
• Irrational feelings of hostility.

Associations of "Irrational" (30 Words)

absurd	An absurd state of affairs. The incidents that followed bordered on the absurd.
absurdity	The quality or state of being ridiculous or wildly unreasonable. The crowd laughed at the absurdity of the clown s behavior.
disordered	Not arranged in order. She went to comb her disordered hair.
foolish	Devoid of good sense or judgment. He was foolish enough to confide in her.
funny	Experiencing odd bodily sensations. Up to some funny business.
garbled	Lacking orderly continuity. I got a garbled set of directions.
illogical	Lacking orderly continuity. An illogical fear of the supernatural.
inadvisable	Not prudent or wise; not recommended. Running on the ice is inadvisable.
incoherent	Not logical or internally consistent. Incoherent with grief.
incongruent	(of melting, dissolution, or other process) affecting the components of an alloy or other substance differently.
incongruity	The quality of disagreeing; being unsuitable and inappropriate. The incongruity of his fleshy face and skinny body disturbed her.
incongruous	Not in harmony or keeping with the surroundings or other aspects of something. The duffel coat looked incongruous with the black dress she wore underneath.
indefensible	Not justifiable by argument. The towns were tactically indefensible.
inexcusable	Too bad to be justified or tolerated. Matt s behaviour was inexcusable.
injudicious	Showing very poor judgement; unwise. An injudicious measure.
inordinate	Unusually or disproportionately large; excessive. A book of inordinate length.
ludicrous	Broadly or extravagantly humorous; resembling farce. Every night he wore a ludicrous outfit.
nonsense	Spoken or written words that have no meaning or make no sense. He was talking absolute nonsense.
prattle	Talk at length in a foolish or inconsequential way. She began to prattle on about her visit to the dentist.
preposterous	So unreasonable as to invite derision. A preposterous suggestion.
ridiculous	Deserving or inviting derision or mockery; absurd. That ridiculous tartan cap.
silly	Dazed from or as if from repeated blows. Don t be silly she said.
superstitious	Having or showing a belief in superstitions. Many superstitious beliefs and practices are connected with sneezing.
unfounded	Having no foundation or basis in fact. Her fear that she had cancer was unfounded.
unjustifiable	Incapable of being justified or explained. An unjustifiable restriction on their freedom.
unjustified	Lacking justification or authorization. Unjustified price increases.
unreasonable	Beyond normal limits. An unreasonable request.
untenable	(of theories etc) incapable of being defended or justified. This argument is clearly untenable.
unwarranted	Lacking justification or authorization. Unwarranted jealousy.
unwise	Showing or resulting from lack of judgment or wisdom. An unwise investor is soon impoverished.