28 entries under underhand topic. ×

26
covert(adjective, show, secret, private, restricted)
10
sneaky(adjective, quiet, dishonest, deceitful, secret)
6
sly(adjective, dishonest, deceitful, secret, sneaky)
6
underhanded(adjective, dishonest, cunning, deceitful, sneaky)
4
classified(adjective, close, secret, restricted, personal)
3
oblique(dishonest, cunning, deceitful, sneaky, underhanded)
2
deceptive(false, dishonest, cunning, deceitful, artful)
2
devious(dishonest, cunning, deceitful, sneaky, underhanded)
1
crafty(adjective, dishonest, cunning, deceitful, sneaky)
1
crooked(dishonest, cunning, deceitful, sneaky, underhanded)
1
double-crossing(dishonest, cunning, deceitful, sneaky, underhanded)
1
duplicitous(dishonest, cunning, deceitful, sneaky, underhanded)
1
indirect(dishonest, cunning, deceitful, sneaky, underhanded)
1
shady(dishonest, cunning, deceitful, sneaky, underhanded)
1
sub-rosa(dishonest, cunning, deceitful, secret, sneaky)
1
treacherous(dishonest, cunning, deceitful, sneaky, underhanded)
1
tricky(dishonest, cunning, deceitful, sneaky, underhanded)
1
two-faced(dishonest, cunning, deceitful, sneaky, underhanded)
1
two-timing(dishonest, cunning, deceitful, sneaky, underhanded)
1
unethical(dishonest, cunning, deceitful, sneaky, underhanded)
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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>