2
disgraceful
2
disreputable(adjective, false, deceitful, lying, untruthful)
2
dissimulating(noun, adjective, wrong, false, dishonest)
2
double-crossing(adjective, wrong, false, dishonest, deceitful)
2
double-tongued
2
estranged(adjective, untrue, untrustworthy, treacherous, unfaithful)
2
evasive(adjective, false, dishonest, deceitful, slick)
2
falsehearted(adjective, mean, bad, evil, low)
2
fishy
2
guileful(adjective, wrong, false, dishonest, deceitful)
2
hateful(adjective, malevolent)
2
hurtful(adjective, malevolent)
2
immoral(adjective, corrupt, dishonest, unprincipled, unethical)
2
iniquitous(adjective, dishonest, immoral, rotten, untrustworthy)
2
mercenary(adjective, dishonest, immoral, rotten, untrustworthy)
2
perjured(adjective, mean, bad, base, false)
2
shameful(adjective, nasty, cruel, unkind, uncaring)
2
shrewd
2
snaky(adjective, false, untrue, sly, treacherous)
2
unconscionable
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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>