40 entries under covert topic. ×

36
secret(adjective, quiet, show, dishonest, deceitful)
20
hidden(verb, adjective, secret, sly, underground)
17
undercover(adjective, adverb, show, dishonest, secret)
15
private(adjective, intimate, secret, unknown, hidden)
15
stealthy(adjective, quiet, dishonest, secret, hidden)
11
confidential(adjective, special, intimate, secret, hidden)
10
hole-and-corner(adjective, secret, private, hidden, spy)
10
sneaky(adjective, quiet, dishonest, deceitful, secret)
6
sly(adjective, dishonest, deceitful, secret, sneaky)
5
skulking(adjective, secret, private, hidden, sneak)
4
classified(adjective, close, secret, restricted, personal)
3
artful(adjective, false, secret, sly, deceptive)
2
buried(adjective, secret, unknown, hidden, concealed)
2
conspiratorial(adjective, underground, undisclosed, sneaky)
2
evasive(sneaky, secretive)
2
foxy(adjective, false, secret, sly, artful)
2
incognito(secret, hidden, spy, underground, undisclosed)
2
shifty(dishonest, cunning, deceitful, sneaky, underhanded)
2
slinking(secret, private, hidden, sneak, sneaky)
2
under-the-table(secret, private, hidden, underground, 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>