6
sly(adjective, false, corrupt, dishonest, deceitful)
6
underhand(adjective, false, corrupt, dishonest, immoral)
6
unprincipled(adjective, false, dishonest, immoral, deceitful)
6
wicked(adjective, mean, base, false, dishonest)
5
dirty(adjective, hard, rough, nasty, rude)
5
disingenuous(adjective, false, dishonest, deceitful, slick)
5
fickle(adjective, false, dishonest, dubious, untrue)
5
knavish(adjective, hard, evil, rough, nasty)
5
unfair(adjective, false, corrupt, dishonest, immoral)
4
bent(adjective, false, dishonest, immoral, deceitful)
4
disaffected(adjective, untrue, untrustworthy, treacherous, unfaithful)
4
dishonorable(adjective, mean, bad, hard, evil)
4
dissembling(noun, adjective, wrong, false, dishonest)
4
double(false, dishonest, deceitful, lying, slick)
4
fake(adjective, false, dishonest, slick, hypocritical)
4
false-hearted(adjective, continue, false, dishonest, trust)
4
foxy
4
malevolent(adjective, mean, bad, evil, base)
4
punic
4
seditious(adjective, untrue, untrustworthy, treacherous, unfaithful)
10 years ago|17k views|share |citing 
APASmart Define. (2016). perfidious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms
ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 20 September 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>