9
cunning(adjective, false, deceitful, lying, falsehood)
9
dishonourable
9
shifty(noun, adjective, wrong, false, dishonest)
8
crafty(adjective, false, corrupt, dishonest, immoral)
8
deceptive(noun, adjective, wrong, false, dishonest)
8
evil(adjective, mean, bad, hard, rough)
8
mendacious(noun, adjective, wrong, false, dishonest)
8
slippery(adjective, false, corrupt, dishonest, immoral)
8
treasonable(adjective, mean, base, false, dishonest)
8
treasonous(adjective, fickle, untrustworthy, unprincipled, disloyal)
8
unreliable(adjective, wrong, false, dishonest, deceitful)
7
duplicitous(noun, adjective, mean, bad, base)
7
foul(adjective, mean, bad, base, dishonest)
7
renegade(adjective, mean, bad, evil, base)
7
tricky(adjective, wrong, false, dishonest, deceitful)
7
villainous(adjective, mean, bad, evil, base)
6
artful(adjective, falsehood)
6
inconstant(adjective, false, dishonest, immoral, rotten)
6
malicious(adjective, mean, bad, hard, evil)
6
mean(verb, adjective, bad, evil, nasty)
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APASmart Define. (2016). perfidious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms
ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 22 September 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>