4
shady(adjective, false, dishonest, immoral, deceitful)
4
sinister(adjective, false, corrupt, dishonest, immoral)
4
slick(adjective, false, dishonest, deceitful, treacherous)
4
two-timing(adjective, wrong, false, dishonest, deceitful)
4
untruthful(noun, adjective, wrong, false, dishonest)
4
venal(adjective, mean, base, dishonest, immoral)
4
vicious(adjective, hard, evil, rough, nasty)
4
wily(adjective, false, deceitful, lying, subtle)
3
Machiavellian
3
apostate(adjective, mean, bad, evil, low)
3
baneful(adjective, malevolent)
3
criminal
3
deceiving(adjective, mean, bad, evil, false)
3
designing(adjective, false, deceitful, lying, subtle)
3
devious(noun, adjective, mean, bad, base)
3
double-faced(deceitful, fickle, unprincipled, dirty-dealing, improbity)
3
felonious
3
fraudulent(adjective, false, dishonest, immoral, deceitful)
3
hostile(adjective, hard, evil, rough, nasty)
3
malignant(adjective, malevolent)
10 years ago|17k views|share |citing 
APASmart Define. (2016). perfidious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms
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>