5
cheating(adjective, false, dishonest, cunning, deceitful)
5
disobedient(adjective, contrary, naughty, defiant, disobedient)
5
double-crossing(adjective, wrong, false, dishonest, cunning)
5
false-hearted(adjective, continue, false, dishonest, trust)
5
furtive(adjective, mean, smooth, smart, dishonest)
5
harmful(adjective, dangerous, injurious, detrimental)
5
malevolent(adjective, mean, bad, evil, unpleasant)
5
ominous(adjective, unpleasant, horrible, disagreeable, dreadful)
5
questionable(adjective, corrupt, dishonest, deceitful, unpredictable)
5
threatening(adjective, delicate, unpleasant, uncertain, horrible)
5
two-timing(adjective, wrong, false, dishonest, cunning)
5
unfair(adjective, false, dishonest, cunning, deceitful)
5
unsound(adjective, severe, delicate, false, awful)
4
Janus-faced
4
baneful(adjective, harmful, injurious, malevolent, detrimental)
4
bent(adjective, false, dishonest, immoral, deceitful)
4
conniving(adjective, mean, smooth, smart, dishonest)
4
criminal(adjective, evil, fake, corrupt, wicked)
4
delusive(adjective, mean, smooth, wrong, smart)
4
dissembling(adjective, mean, smooth, wrong, smart)
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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>