Need another word that means the same as “underground”? Find 42 synonyms and 30 related words for “underground” in this overview.
The synonyms of “Underground” are: below ground, below the surface, under the earth, in the earth, behind closed doors, out of sight, clandestine, hugger-mugger, hush-hush, secret, surreptitious, undercover, belowground, subterranean, buried, sunken, covert, private, confidential, closet, backstair, stealthy, conspiratorial, concealed, hidden, alternative, radical, revolutionary, unconventional, unorthodox, avant-garde, experimental, innovative, groundbreaking, pioneering, novel, metro, subway, subway system, tube, resistance, resistance movement
According to the Oxford Dictionary of English, “underground” as a noun can have the following definitions:
metro | A major city or metropolitan region. Auditions were held in all major metros of the country. |
resistance | The degree to which a substance or device opposes the passage of an electric current causing energy dissipation By Ohm s law resistance measured in ohms is equal to the voltage divided by the current. Government forces were unable to crush guerrilla style resistance. |
resistance movement | A secret group organized to overthrow a government or occupation force. |
subway | An underground railway. In Paris the subway system is called the metro and in London it is called the tube or the underground. |
subway system | An electric railway operating below the surface of the ground (usually in a city. |
tube | The inner tube of a bicycle tyre. Watching the tube in a country bar. |
According to the Oxford Dictionary of English, “underground” as an adjective can have the following definitions:
alternative | (of two things) mutually exclusive. An alternative lifestyle. |
avant-garde | Radically new or original. |
backstair | Secret and sly or sordid. Backstairs intimacies. |
belowground | Under the level of the ground. Most of his friends are now belowground. |
buried | Placed in a grave. Buried treasure. |
clandestine | Kept secret or done secretively, especially because illicit. She deserved better than these clandestine meetings. |
closet | Secret; covert. A closet smoker. |
concealed | Hidden on any grounds for any motive. A concealed compartment in his briefcase. |
confidential | Entrusted with private or restricted information. In confidential tone of voice. |
conspiratorial | Relating to or characteristic of conspiracy or conspirators. There are several who think this is some sort of vast conspiratorial plot on the part of the press. |
covert | Secret or hidden; not openly practiced or engaged in or shown or avowed. A woman covert. |
experimental | Relating to scientific experiments. Experimental results. |
groundbreaking | Innovative; pioneering. Groundbreaking research into fertility problems. |
hidden | Difficult to find. A hidden room or place of concealment such as a priest hole. |
hugger-mugger | In utter disorder. |
hush-hush | Conducted with or marked by hidden aims or methods. |
innovative | (of a person) introducing new ideas; original and creative in thinking. Innovative ways to help unemployed people. |
novel | Original and of a kind not seen before. The computer produced a completely novel proof of a well known theorem. |
pioneering | Involving new ideas or methods. His pioneering work on consciousness. |
private | Concerning things deeply private and personal. Private property. |
radical | Markedly new or introducing radical change. Radical political views. |
revolutionary | Of or relating to or characteristic or causing an axial or orbital turn. The revolutionary army. |
secret | Given in confidence or in secret. A secret marriage. |
stealthy | Behaving or done in a cautious and surreptitious manner, so as not to be seen or heard. Stealthy footsteps. |
subterranean | Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)- Bertrand Russell. Subterranean motives for murder. |
sunken | Having a sunken area. Her face was white with sunken cheeks. |
surreptitious | Kept secret, especially because it would not be approved of. A surreptitious glance at his watch. |
unconventional | Not conventional or conformist. His unconventional approach to life. |
undercover | Conducted with or marked by hidden aims or methods. An undercover police operation. |
unorthodox | Independent in behavior or thought. An unorthodox lifestyle. |
According to the Oxford Dictionary of English, “underground” as an adverb can have the following definitions:
behind closed doors | Of timepieces. |
below ground | Further down. |
below the surface | In or to a place that is lower. |
in the earth | To or toward the inside of. |
out of sight | Away from home. |
under the earth | Further down. |
basement | The floor of a building which is partly or entirely below ground level. Basement rocks. |
below | Below deck. He jumped from the window into the moat below. |
beneath | Hidden behind an appearance. The smile revealed the evil beneath. |
burrow | Make a thorough inquiry; investigate. The child burrowed deeper into the bed. |
bury | Enclose or envelop completely, as if by swallowing. I tried to bury these unpleasant memories. |
cache | Provide hardware with a cache memory. The device comes complete with 4MB of RAM to cache the hard drive. |
cave | Hollow out as if making a cave or opening. The narrow gorge contains a series of prehistoric caves. |
cavern | Hollow out as if making a cavern. A dark cavern of a shop. |
clandestine | Kept secret or done secretively, especially because illicit. Clandestine intelligence operations. |
concealed | Not accessible to view. Concealed or hidden damage. |
covert | A feather covering the base of a main flight or tail feather of a bird. Covert operations against the dictatorship. |
crypt | An underground room or vault beneath a church, used as a chapel or burial place. |
den | Of a wild animal live in a den. An opium den. |
dig | The act of digging. She gave me a sharp dig in the ribs. |
disguised | Having changed one’s appearance in order to conceal one’s identity. The disguised form of aggression available to the powerless against the powerful. |
dripstone | A moulding over a door or window which deflects rain. |
entomb | Place in a grave or tomb. The pharaohs were entombed in the pyramids. |
excavate | Form by hollowing. Carnegie had a lake excavated for Princeton University s rowing team. |
hidden | Designed to elude detection. Hidden valleys. |
lair | The habitation of wild animals. He saw that his dogs had roused a wild boar from its lair. |
mausoleum | A large burial chamber, usually above ground. A cultural mausoleum such as the Tate. |
miner | A person who obtains units of a cryptocurrency by running computer processes to solve specific mathematical problems. The miners were freed after spending four days trapped underground. |
secrecy | The action of keeping something secret or the state of being kept secret. The bidding is conducted in secrecy. |
stalagmite | A cylinder of calcium carbonate projecting upward from the floor of a limestone cave. |
stealthy | Behaving or done in a cautious and surreptitious manner, so as not to be seen or heard. Stealthy footsteps. |
subterranean | Lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed. Subterranean motives for murder. |
surreptitious | Kept secret, especially because it would not be approved of. Surreptitious mobilization of troops. |
ulterior | Beyond what is immediate or present; coming in the future. Could there be an ulterior motive behind his request. |
undercover | Conducted with or marked by hidden aims or methods. An undercover police operation. |
underneath | Situated directly below something else. Paint was peeling off in flakes to reveal greyish plaster underneath. |
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