Synonyms|358Antonyms|72|Broader|2Narrower|0Related|322

50 entries under underground topic. ×

20
covert(adjective, secret, hidden, sly, clandestine)
15
hidden(verb, adjective, secret, clandestine)
13
private(adjective, secret, unknown, hidden, clandestine)
11
sneak(adjective, clandestine, undisclosed)
7
backstairs(adjective, clandestine, undisclosed)
7
cloak-and-dagger(adjective, full, secret, clandestine)
6
confidential(adjective, secret, hidden, spy, clandestine)
6
occult(noun, secret, unknown, hidden)
4
ambiguous(obscure, clandestine, undisclosed)
4
esoteric(secret, unknown, hidden, concealed)
4
mystic(adjective, secret, unknown, hidden)
4
reticent(clandestine, undisclosed, concealment)
4
secluded(adjective, secret, unknown, hidden)
3
classified(secret, clandestine, undisclosed, top-secret)
3
closet(noun, adjective, secret, clandestine)
3
conspiratorial(adjective, clandestine, undisclosed, sneaky)
3
in ambush(expression, clandestine, undisclosed)
3
mystical(adjective, secret, unknown, hidden)
3
unrevealed(adjective, secret, unknown, hidden)
2
inside(clandestine, undisclosed)
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APASmart Define. (2015). surreptitious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/surreptitious/thesaurus/synonyms
ChicagoSmart Define. 2015. "surreptitious thesaurus" https://smartdefine.org/surreptitious/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, surreptitious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/surreptitious/thesaurus/synonyms>.
MLASmart Define. "surreptitious thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/surreptitious/thesaurus/synonyms>