4
disreputable(adjective, disreputable)
4
dubious(adjective, disreputable)
4
felonious(adjective, wrong, wicked, criminal, vice)
4
glaring(adjective, bad, sinful)
4
grave
4
hellish(adjective, evil, unpleasant, vile, wicked)
4
horrid(adjective, evil, offensive, unpleasant, base)
4
infernal(adjective, bad, evil, vile, wicked)
4
knavish(adjective, wicked, dishonest, immoral, rotten)
4
lawless(wrong, wicked, criminal, illegal, illegitimate)
4
lousy(adjective, good)
4
naughty(adjective, wicked)
4
opprobrious(adjective, bad, evil, wicked, immoral)
4
putrid(adjective, bad, evil, offensive, unpleasant)
4
scheming
4
shabby(adjective, good)
4
shocking(adjective, evil, awful, terrible, vicious)
4
unhealthy(adjective, mean, evil, low, immoral)
4
unscrupulous(adjective, corrupt, wicked, dishonest, immoral)
4
unspeakable(terrible, shocking, shameful, atrocious, disgraceful)
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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>