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underground

adjective

Synonyms and Antonyms of underground

  1. 1 undertaken or done so as to escape being observed or known by others <an underground operation to smuggle ancient artifacts out of the country> Synonyms backstairs, behind-the-scenes, clandestine, covert, furtive, hole-and-corner, hugger-mugger, hush-hush, private, privy, sneak, sneaking, sneaky, stealth, stealthy, surreptitious, undercover, secret, underhand, underhandedRelated Words back-channel, closed-door, off-the-books, off-the-record; classified, confidential, restricted, top secret, undisclosed; concealed, hidden, secreted, subterranean, unadvertised, unexposedNear Antonyms acknowledged, avowed; aboveboard, straightforward, unconcealed, undisguised; unclassified, unrestricted; clear, evident, manifest, obvious, patent, plainAntonyms open, overt, public

  2. 2 being, situated, or operating beneath the surface of the earth <an underground shopping mall that is part of the city's subway system> Synonyms subsurface, subterranean, belowgroundAntonyms aboveground, surface




underground

noun

Synonyms and Antonyms of underground

  1. a secret organization in a conquered country fighting against enemy forces <joined the underground while still a teenager> Synonyms resistanceRelated Words cabal, conspiracy





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