50 entries under unfaithful topic. ×

6
underhand(adjective, false, corrupt, dishonest, immoral)
5
fickle(adjective, false, dishonest, dubious, untrue)
4
disaffected(adjective, untrue, untrustworthy, treacherous)
4
false-hearted(adjective, continue, false, dishonest, trust)
4
seditious(adjective, untrue, untrustworthy, treacherous)
4
slick(adjective, false, dishonest, deceitful, treacherous)
4
two-timing(adjective, wrong, false, dishonest, deceitful)
4
untruthful(noun, adjective, wrong, false, dishonest)
3
apostate(adjective, mean, bad, evil, low)
3
subversive(adjective, untrue, untrustworthy, treacherous)
2
alienated(adjective, untrue, untrustworthy, treacherous)
2
capricious(adjective, false, dishonest, dubious, untrustworthy)
2
cheating(adjective, false, dishonest, deceitful, lying)
2
double-crossing(adjective, wrong, false, dishonest, deceitful)
2
estranged(adjective, untrue, untrustworthy, treacherous)
2
snaky(adjective, false, untrue, sly, treacherous)
2
unloyal(adjective, false, dishonest, dubious, unsound)
2
unpatriotic(adjective, fickle, untrue, untrustworthy, unprincipled)
1
changeful(adjective, false, dishonest, dubious, fickle)
1
misleading(adjective, wrong, false, dishonest, deceitful)
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APASmart Define. (2016). perfidious thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms
ChicagoSmart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, perfidious thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>.
MLASmart Define. "perfidious thesaurus" 4 March 2016. Web. 1 October 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms>