48 entries under underhanded topic. ×

9
disingenuous(adjective, honest, false, dishonest, cunning)
9
unscrupulous(adjective, mean, bad, smooth, wrong)
9
untrustworthy(adjective, false, dishonest, cunning, deceitful)
7
fraudulent(adjective, false, corrupt, dishonest, cunning)
7
two-faced(adjective, bad, wrong, false, dishonest)
6
base(adjective, low, corrupt, dishonest, crooked)
6
crooked(adjective, mean, bad, smooth, wrong)
6
double-dealing(adjective, mean, smooth, smart, false)
6
mean(verb, adjective, smooth, smart, low)
5
snide(adjective, false, dishonest, misleading, sly)
4
cowardly(adjective, dishonest)
4
shady(adjective, bad, wrong, false, corrupt)
4
unreliable(adjective, false, dishonest, deceitful, slick)
3
concealed(adjective, dishonest, cunning, deceitful)
3
contemptible(adjective, low, corrupt, dishonest, crooked)
3
deceptive(adjective, mean, smooth, smart, false)
3
low(adjective, corrupt, dishonest, deceitful, crooked)
3
unethical(adjective, bad, wrong, informal, corrupt)
1
double-crossing(adjective, bad, wrong, false, dishonest)
1
malicious(adjective, dishonest)
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APASmart Define. (2015). sneaky thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/sneaky/thesaurus/synonyms
ChicagoSmart Define. 2015. "sneaky thesaurus" https://smartdefine.org/sneaky/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, sneaky thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/sneaky/thesaurus/synonyms>.
MLASmart Define. "sneaky thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/sneaky/thesaurus/synonyms>