2
acute(sharp, smart, intelligent, cunning, clever)
2
amoral(corrupt, dishonest, immoral, fickle, untrustworthy)
2
arch(adjective, mean, smooth, cunning, knowing)
2
bad(wrong, immoral, unprincipled)
2
base
2
buttoned up(verb, adjective, phrasal verb, secret, concealment)
2
circuitous(ambiguous, rambling, incidental, tortuous)
2
closet(noun, adjective, hidden, clandestine, underground)
2
diplomatic
2
dissembling(adjective, mean, smooth, cunning, knowing)
2
doubtful
2
fake(adjective, bad, wrong, false, dishonest)
2
falsehearted(fickle, untrustworthy, unprincipled, dirty-dealing)
2
felonious
2
immoral(wrong, corrupt, dishonest, unprincipled)
2
improper(adjective, wrong, corrupt, dishonest, immoral)
2
incognito(secret, hidden, spy, clandestine, underground)
2
ingenious(adjective, mean, smooth, sharp, smart)
2
intriguing(adjective, mean, smooth, cunning, knowing)
2
knowing(sharp, smart, intelligent, cunning, clever)
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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>