Synonyms of underground

underground 1 of 3

adverb

as in undercover

Synonyms & Similar Words

• undercover
• stealthily
• surreptitiously
• clandestinely
• secretively
• furtively
• covertly
• underhanded
• sneakily
• underhand
• underhandedly
• offstage
• collusively
• conspiratorially
• offscreen
• à deux
• inwardly
• sotto voce
• tête-à-tête
• secretly
• privately
• backstage
• intimately
• confidentially
• in camera

Antonyms & Near Antonyms

• publicly
• openly

underground

2 of 3

adjective

1

as in clandestine

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 & Similar Words

• clandestine
• undercover
• covert
• sneak
• private
• sneaking
• stealth
• secret
• surreptitious
• furtive
• stealthy
• behind-the-scenes
• hole-and-corner
• sneaky
• underhanded
• undisclosed
• backstairs
• underhand
• privy
• subterranean
• hush-hush
• confidential
• hidden
• off-the-books
• closed-door
• hugger-mugger
• classified
• secreted
• restricted
• off-the-record
• top secret
• concealed
• unexposed
• back-channel
• unadvertised

Antonyms & Near Antonyms

• public
• open
• overt
• avowed
• acknowledged
• straightforward
• unrestricted
• unclassified
• obvious
• evident
• clear
• plain
• manifest
• undisguised
• unconcealed
• aboveboard
• patent

2

as in subterranean

being, situated, or operating beneath the surface of the earth

an underground shopping mall that is part of the city's subway system

Synonyms & Similar Words

• subterranean
• subsurface
• belowground

Antonyms & Near Antonyms

• surface
• aboveground

underground

3 of 3

noun

as in resistance

a secret organization in a conquered country fighting against enemy forces

joined the underground while still a teenager

Synonyms & Similar Words

• resistance
• conspiracy
• cabal