5
dishonourable(adjective, dislike, disgusting, hate, yuck)
5
fiendish(adjective, bad, wrong, evil, nasty)
5
filthy(adjective, good, evil, offensive, unpleasant)
5
rank(adjective, bad, evil, offensive, unpleasant)
5
reprehensible(adjective, evil)
5
repugnant(adjective, good, evil, corrupt, immoral)
5
repulsive(adjective, bad, evil, offensive, unpleasant)
5
scurvy
5
shameless(adjective, wrong, evil, corrupt, wicked)
5
shoddy(adjective, dislike, disgusting, hate, yuck)
5
terrible(adjective, evil, wicked)
5
unlawful(adjective, wrong, corrupt, wicked, dishonest)
5
unprincipled(adjective, bad, wrong, evil, violent)
4
amoral(adjective, wicked)
4
baneful(adjective, evil, low, corrupt, immoral)
4
crafty
4
deceitful
4
degraded(adjective, evil, low, corrupt, immoral)
4
deplorable(adjective, wrong, wicked, extreme, shocking)
4
devious(adjective, wicked)
10 years ago|20k views|share |citing 
APASmart Define. (2015). nefarious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/nefarious/thesaurus/synonyms
ChicagoSmart Define. 2015. "nefarious thesaurus" https://smartdefine.org/nefarious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, nefarious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/nefarious/thesaurus/synonyms>.
MLASmart Define. "nefarious thesaurus" 8 October 2015. Web. 22 September 2026. <https://smartdefine.org/nefarious/thesaurus/synonyms>