Synonyms of underground in English:

underground


See definition of underground

adjective

1‘they drove up the ramp from the underground car park’

SYNONYMS
subterranean, subterrestrial, below ground, buried, sunken, lower-level, basement
rare hypogean
ANTONYMS

surface, overhead

2‘the underground organizations are designed to spread populist propaganda’

SYNONYMS
clandestine, secret, surreptitious, covert, undercover, private, confidential, closet, hole-and-corner, cloak-and-dagger, hugger-mugger, back-alley, backstair, stealthy, conspiratorial, concealed, hidden, shrouded
sneaky, sly, underhand, shifty, furtive
resistance, subversive, guerrilla, mercenary, revolutionary, rebellious, dissident, insurgent, insurrectionary, renegade, mutinous
black
informal hush-hush

3‘the New York underground art scene’

SYNONYMS
alternative, radical, revolutionary, unconventional, unorthodox, avant-garde, experimental, innovative, groundbreaking, pioneering, novel
subversive

adverb

1‘the insects spend years underground as larvae’

SYNONYMS
below ground, below the surface, under the earth, in the earth

2‘the group went underground and issued calls for national resistance’

SYNONYMS
into hiding, into secrecy, into seclusion, undercover, behind closed doors, out of sight

noun

1‘he took the underground back to his studio apartment’

SYNONYMS
underground railway, metro
North American subway
British informal tube

2‘the information had been furnished by the French underground’

SYNONYMS
resistance movement, resistance, illegal opposition
partisans, guerrillas, freedom fighters
historical Maquis