4
questionable(adjective, dishonest, deceitful, unreliable, insecure)
4
seditious(adjective, untrue, untrustworthy, treacherous, unfaithful)
4
sly(adjective, false, dishonest, deceitful, slick)
4
trothless(falsehood, improbity)
4
trustless(adjective, dishonest, deceitful, unreliable, fickle)
4
truthless(adjective, true, unreliable, falsehood, insecure)
4
two-timing(adjective, false, dishonest, deceitful, unreliable)
4
uncertain(adjective, unsettled, hesitant, dubious, unreliable)
4
unconverted(adjective, dishonest, fickle, untrustworthy, unprincipled)
4
unprincipled(adjective, dishonest, immoral, rotten, fickle)
4
unsteady(adjective, unreliable, changeable, insecure, treacherous)
4
unsure(adjective, uncertain, dishonest, unsettled, hesitant)
4
untruthful(noun, adjective, wrong, false, dishonest)
4
villainous(adjective, mean, bad, evil, base)
3
adulterous(adjective, false, fickle, untrue, untrustworthy)
3
atheist
3
cheating(adjective, false, dishonest, cunning, lying)
3
conscienceless
3
creedless(adjective, irreligious)
3
evasive(adjective, false, dishonest, deceitful, falsehood)
11 years ago|16k views|share |citing 
APASmart Define. (2015). faithless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/faithless/thesaurus/synonyms
ChicagoSmart Define. 2015. "faithless thesaurus" https://smartdefine.org/faithless/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, faithless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/faithless/thesaurus/synonyms>.
MLASmart Define. "faithless thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/faithless/thesaurus/synonyms>