Thesaurus
underground
adjective
Synonyms and Antonyms of UNDERGROUND
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, underground, underhand, underhanded
Related Words back-channel, closed-door, off-the-books, off-the-record; classified, confidential, restricted, top secret, undisclosed; concealed, hidden, secreted, subterranean, unadvertised, unexposed
Near Antonyms acknowledged, avowed; aboveboard, straightforward, unconcealed, undisguised; unclassified, unrestricted; clear, evident, manifest, obvious, patent, plain
2
being, situated, or operating beneath the surface of the earth <an underground shopping mall that is part of the city's subway system>
Antonyms aboveground, surface
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