- Definitions|2
- Thesaurus|1.9k
- Abbreviations|0
| machiavellian(adjective, wicked) | |
| malefic | |
| miserable(evil, shameful, depraved) | |
| noisome(adjective, bad, evil, offensive, unpleasant) | |
| peccant(wrong, wicked, criminal, illegal, unlawful) | |
| perverted(adjective, evil, immoral, shameful, depraved) | |
| profligate(adjective, evil, low, corrupt, wicked) | |
| ribald(adjective, disreputable) | |
| ruthless(adjective, wicked) | |
| sneaky | |
| squalid(adjective, offensive, unpleasant, disgusting, indecent) | |
| tricky | |
| unclean(adjective, wrong, evil, offensive, unpleasant) | |
| unconscionable(shocking, shameful, disgraceful) | |
| underhand | |
| underhanded(adjective, dishonest, immoral, rotten, untrustworthy) | |
| ungodly(shocking, shameful, disgraceful) | |
| unholy(adjective, wicked) | |
| unrighteous(wrong, unfair, unjust, illegal, unlawful) | |
| virulent(adjective, wicked, harmful, injurious, detrimental) |
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| APA | Smart Define. (2015). nefarious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/nefarious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "nefarious thesaurus" https://smartdefine.org/nefarious/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, nefarious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/nefarious/thesaurus/synonyms>. |
| MLA | Smart Define. "nefarious thesaurus" 8 October 2015. Web. 22 September 2026. <https://smartdefine.org/nefarious/thesaurus/synonyms> |