Synonyms|382Antonyms|120|Broader|6Narrower|0Related|370

44 entries under underground topic. ×

26
covert(adjective, show, secret, private, restricted)
20
hidden(verb, adjective, secret, sly)
15
private(adjective, intimate, secret, unknown, hidden)
8
arcane(adjective, secret, hidden, undisclosed)
6
cloak-and-dagger(adjective, show, full, secret, sly)
5
backstairs(adjective, undisclosed)
5
occult(noun, adjective, secret, unknown, hidden)
4
inside(adjective, special, intimate, personal)
3
mystic(adjective, secret, unknown, hidden)
3
restricted(adjective, secret, undisclosed, top-secret)
2
camouflaged(adjective, secret, hidden, undisclosed)
2
conspiratorial(adjective, undisclosed, sneaky, covert)
2
esoteric(adjective, secret, unknown, hidden)
2
incognito(secret, hidden, spy, undisclosed)
2
obscure(adjective, secret, unknown, hidden)
2
recondite(adjective, secret, unknown, hidden)
2
sneak(undisclosed, skulking)
2
sub rosa(expression, adjective, idiom, adverb, show)
2
top secret(expression, undisclosed)
2
under-the-table(secret, private, hidden, sneaky)
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APASmart Define. (2015). clandestine thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/clandestine/thesaurus/synonyms
ChicagoSmart Define. 2015. "clandestine thesaurus" https://smartdefine.org/clandestine/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, clandestine thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/clandestine/thesaurus/synonyms>.
MLASmart Define. "clandestine thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/clandestine/thesaurus/synonyms>