5
immoral(adjective, low, corrupt, dishonest, deceitful)
5
indirect(adjective, honest, false, dishonest, cunning)
5
mercenary(adjective, dishonest, immoral, rotten, untrustworthy)
5
praetorian(adjective, dishonest, immoral, rotten, untrustworthy)
5
scheming(adjective, false, corrupt, dishonest, cunning)
5
two-faced(adjective, mean, base, false, dishonest)
4
astute
4
evasive(adjective, dishonest, deceitful, tricky, crafty)
4
foul(adjective, mean, base, corrupt, dishonest)
4
hypocritical(adjective, mean, bad, base, false)
4
perfidious(adjective, mean, base, false, dishonest)
4
questionable(adjective, corrupt, dishonest, immoral, deceitful)
4
skulking(sneaky, covert, secretive)
4
subtle(adjective, false, misleading, illusory)
4
underarm
4
underground(secret, clandestine, undisclosed)
4
untrustworthy(adjective, mean, bad, base, false)
4
untruthful(adjective, false, corrupt, wicked, dishonest)
3
double-faced(adjective, dishonest, deceitful, duplicitous)
3
felonious(adjective, dishonest)
10 years ago|12k views|share |citing 
APASmart Define. (2016). underhanded thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/underhanded/thesaurus/synonyms
ChicagoSmart Define. 2016. "underhanded thesaurus" https://smartdefine.org/underhanded/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, underhanded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/underhanded/thesaurus/synonyms>.
MLASmart Define. "underhanded thesaurus" 22 January 2016. Web. 22 September 2026. <https://smartdefine.org/underhanded/thesaurus/synonyms>