4
unpredictable(adjective, careless, loose, unreliable, fickle)
4
vicious(adjective, hard, evil, rough, nasty)
4
vile(adjective, hard, evil, rough, nasty)
3
adulterous(adjective, false, fickle, untrue, untrustworthy)
3
apostate(adjective, mean, bad, evil, low)
3
awful
3
bad
3
baleful(adjective, malevolent)
3
blackguardly(shameful, disgraceful, disreputable)
3
capricious(adjective, false, loose, unstable, dishonest)
3
catchy(adjective, false, dishonest, misleading, unfaithful)
3
churlish(adjective, hard, rough, nasty, rude)
3
clever(adjective, cunning, deceitful, knowing, sly)
3
contemptible(adjective, hard, evil, rough, nasty)
3
contrary(adjective, disobedient)
3
damaging(adjective, harmful, dangerous, injurious, detrimental)
3
defiant(adjective, disobedient)
3
degenerate(adjective, evil, wicked, immoral, harmful)
3
delusory(adjective, smooth, wrong, false, dishonest)
3
despicable(adjective, hard, evil, rough, nasty)
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APASmart Define. (2016). treacherous thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/treacherous/thesaurus/synonyms
ChicagoSmart Define. 2016. "treacherous thesaurus" https://smartdefine.org/treacherous/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, treacherous thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/treacherous/thesaurus/synonyms>.
MLASmart Define. "treacherous thesaurus" 4 March 2016. Web. 27 September 2026. <https://smartdefine.org/treacherous/thesaurus/synonyms>