5
feline(feature, trait, cunning, craftiness, concealment)
5
plotting(adjective, mean, smooth, cunning, knowing)
5
private(adjective, secret, hidden, clandestine, fraudulent)
5
reticent(adjective, secret, concealment, sneaky, stealthy)
5
slick(adjective, mean, sharp, false, dishonest)
5
underarm
5
untrustworthy(adjective, false, dishonest, cunning, deceitful)
4
backstairs(adjective, clandestine, underground, undisclosed)
4
bent(adjective, false, corrupt, dishonest, immoral)
4
deceiving(adjective, false, wicked, dishonest, cunning)
4
dishonorable(adjective, mean, smooth, corrupt, dishonest)
4
foul(adjective, corrupt, dishonest, shady)
4
hugger-mugger
4
insincere(adjective, false, dishonest, cunning, deceitful)
4
lying(adjective, false, corrupt, dishonest, cunning)
4
mendacious(adjective, false, dishonest, cunning, deceitful)
4
reserved(adjective, secret, concealment, sneaky, stealthy)
4
sinister(adjective, false, immoral, deceitful, lying)
4
smooth(adjective, mean, sharp, smart, intelligent)
4
unjust(adjective, fair, dishonest, cunning, deceitful)
11 years ago|11k views|share |citing 
APASmart Define. (2015). underhand thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/underhand/thesaurus/synonyms
ChicagoSmart Define. 2015. "underhand thesaurus" https://smartdefine.org/underhand/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, underhand thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/underhand/thesaurus/synonyms>.
MLASmart Define. "underhand thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/underhand/thesaurus/synonyms>