Synonyms|358Antonyms|119|Broader|7Narrower|1Related|1.3k
2
undependable
2
unethical(adjective, dishonest, immoral, deceitful, rotten)
2
unloyal(adjective, false, dishonest, dubious, unsound)
2
unpatriotic(adjective, fickle, untrue, untrustworthy, unprincipled)
2
venomous(adjective, malevolent)
2
vile(adjective, hard, evil, rough, nasty)
1
abominable
1
adulterine(adjective, false, fickle, untrue, untrustworthy)
1
adulterous(adjective, false, fickle, untrue, untrustworthy)
1
amoral(adjective, fickle, untrustworthy, unprincipled, dirty-dealing)
1
antagonistic(adjective, malevolent)
1
artificial
1
awful
1
bad
1
bad-tempered(adjective, hard, evil, rough, nasty)
1
bitter(adjective, malevolent)
1
black-hearted(adjective, malevolent)
1
blackguardly
1
bribable(adjective, dishonest, immoral, rotten, untrustworthy)
1
calculating
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ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 23 September 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>