| iniquitous | |
| insalubrious(adjective, unhealthy) | |
| mephitic | |
| morbid(adjective, nasty, gloomy, sickly) | |
| pathological(adjective, unhealthy) | |
| perfidious(adjective, malevolent) | |
| pestilent(adjective, help, unhealthy) | |
| sharp | |
| sinful(adjective, corrupt, immoral, injurious, damaging) | |
| splenetic(adjective, mean, nasty, malicious, hurtful) | |
| toxicant(adjective, poisonous) | |
| undesireworthy(adjective, arouse bad feelings, arouse bad emotions) | |
| unfriendly(adjective, mean, nasty, cold, ill) | |
| unhygienic(adjective, unhealthy) | |
| vitriolic(adjective, mean, nasty, offensive, vile) | |
| allergic(mean, nasty, unfriendly, angry, antagonistic) | |
| atrocious | |
| barbaric(adjective, animal, mean, cruel, vicious) | |
| barbarous(adjective, animal, mean, cruel, vicious) | |
| belligerent(adjective, mean, nasty, unfriendly, hateful) |
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| APA | Smart Define. (2016). malignant thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/malignant/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "malignant thesaurus" https://smartdefine.org/malignant/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, malignant thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/malignant/thesaurus/synonyms>. |
| MLA | Smart Define. "malignant thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/malignant/thesaurus/synonyms> |