1
ill-tempered(adjective, hard, evil, rough, nasty)
1
incontinent(adjective, false, untrue, disloyal, cheating)
1
infamous(adjective, hard, evil, rough, nasty)
1
infernal
1
infidel
1
insurgent
1
liverish(adjective, hard, evil, rough, nasty)
1
lousy(adjective, hard, evil, rough, nasty)
1
low-down and dirty(expression, adjective, idiom, hard, evil)
1
lowest(rough, rude, hostile, irritable, touchy)
1
malign(adjective, hard, evil, rough, nasty)
1
misleading(adjective, wrong, false, dishonest, deceitful)
1
moonlighting(adjective, false, fickle, untrue, untrustworthy)
1
mythomaniac(adjective, mean, bad, evil, base)
1
not true to(expression, adjective, idiom, false, fickle)
1
of bad faith(expression, adjective, idiom, false, fickle)
1
on the take(expression, adjective, idiom, dishonest, immoral)
1
one-sided
1
open(adjective, dishonest, immoral, rotten, untrustworthy)
1
outrageous
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APASmart Define. (2016). perfidious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms
ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>