7
artful(adjective, false, dishonest, cunning, deceitful)
7
clandestine(adjective, dishonest, cunning, deceitful, sneaky)
7
covert(adjective, dishonest, deceitful, secret, clandestine)
7
fraudulent(adjective, false, corrupt, dishonest, immoral)
7
secret(adjective, dishonest, cunning, deceitful, clandestine)
7
surreptitious(adjective, dishonest, deceitful, crafty, clandestine)
7
unethical(adjective, corrupt, dishonest, immoral, cunning)
7
unscrupulous(adjective, mean, base, false, corrupt)
6
double-dealing(adjective, mean, base, false, corrupt)
6
insincere(adjective, false, dishonest, cunning, deceitful)
6
shady(adjective, false, corrupt, dishonest, immoral)
6
slippery(adjective, false, corrupt, dishonest, cunning)
6
stealthy(adjective, dishonest, cunning, deceitful, clandestine)
6
undercover(dishonest, cunning, deceitful, secret, hidden)
5
backstairs(clandestine, underground, undisclosed)
5
calculating(adjective, dishonest, deceitful, tricky, crafty)
5
deceptive(adjective, bad, false, dishonest, cunning)
5
dirty(adjective, corrupt, dishonest, deceitful, crooked)
5
dishonorable(adjective, mean, bad, base, dishonest)
5
foxy(adjective, false, dishonest, cunning, deceitful)
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APASmart Define. (2016). underhanded thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underhanded/thesaurus/synonyms
ChicagoSmart Define. 2016. "underhanded thesaurus" https://smartdefine.org/underhanded/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, underhanded thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underhanded/thesaurus/synonyms>.
MLASmart Define. "underhanded thesaurus" 22 January 2016. Web. 21 September 2026. <https://smartdefine.org/underhanded/thesaurus/synonyms>