30 entries under covert topic. ×

20
sneaky(adjective, honest, dishonest, deceitful, sly)
18
sly(adjective, honest, dishonest, deceitful, secret)
17
undercover(adjective, dishonest, secret, hidden, spy)
15
hidden(verb, adjective, secret, clandestine, underground)
14
hush-hush(adjective, dishonest, secret, hidden, sneaky)
13
underground(adjective, secret, unknown, hidden, concealed)
11
hole-and-corner(adjective, secret, hidden, spy, sneaky)
11
skulking(adjective, secret, concealment, sneaky)
6
confidential(adjective, secret, hidden, spy, clandestine)
5
under-the-table(adjective, secret, hidden, clandestine, sneaky)
4
disguised(deception, secret, unknown, hidden, clandestine)
4
slinking(adjective, secret, sneaky, secretive)
4
stealth(noun, secret, hidden, spy)
3
artful(mean, dishonest, deceitful, sly, crafty)
3
conspiratorial(adjective, clandestine, underground, undisclosed, sneaky)
3
sub-rosa(adjective, dishonest, cunning, secret, clandestine)
3
under cover(expression, secret, spy, recreant)
3
underneath(secret, hidden, spy)
2
cautious(adjective, sneaky, secretive)
2
foxy(adjective, mean, dishonest, deceitful, sly)
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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>