2
lubricious(adjective, honest, dishonest, cunning, fickle)
2
nefarious
2
not kosher
2
politic
2
profound(sharp, smart, intelligent, cunning, prudent)
2
retired(adjective, secret, sneaky, stealthy)
2
rotten
2
roundabout(deceitful, tricky, rambling, circuitous, scheming)
2
secretly
2
slyly
2
stealth(noun, secret, hidden, spy, covert)
2
stealthily(adverb, concealment)
2
suspicious
2
taciturn
2
two-timing(adjective, bad, wrong, false, corrupt)
2
uncommunicative
2
unconscionable(corrupt, dishonest, immoral, unprincipled)
2
underhand dealing(expression, idiom, concealment)
2
undisclosed(adjective, clandestine, underground)
2
unreliable(adjective, false, true, dishonest, deceitful)
11 years ago|11k views|share |citing 
APASmart Define. (2015). underhand thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/underhand/thesaurus/synonyms
ChicagoSmart Define. 2015. "underhand thesaurus" https://smartdefine.org/underhand/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, underhand thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/underhand/thesaurus/synonyms>.
MLASmart Define. "underhand thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/underhand/thesaurus/synonyms>