| inimical(adjective, mean, nasty, offensive, cold) | |
| internecine(adjective, injurious, damaging, destructive, fatal) | |
| maleficent(adjective, malevolence) | |
| noisome(adjective, inexpedience) | |
| ruinous(adjective, bad, injurious, damaging, deadly) | |
| septic(adjective, unhealthy) | |
| treacherous(adjective, dangerous, malevolent) | |
| unhealthy(adjective, bad, offensive, heavy, foul) | |
| acerbic | |
| bad to the bone | |
| catty(adjective, mean, nasty, vicious, wicked) | |
| corrosive(adjective, malevolent) | |
| corrupt | |
| deathly(adjective, dangerous) | |
| diabolic | |
| diseased(adjective, unhealthy, spreading, cancerous) | |
| disserviceable | |
| disturbing(adjective, arouse bad feelings) | |
| envenomed | |
| ill-natured(adjective, mean, malicious, malevolent, vindictive) |
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| APA | Smart Define. (2016). malignant thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/malignant/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "malignant thesaurus" https://smartdefine.org/malignant/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, malignant thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/malignant/thesaurus/synonyms>. |
| MLA | Smart Define. "malignant thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/malignant/thesaurus/synonyms> |