| miasmic | |
| murderous(adjective, nasty, violent, vicious, wicked) | |
| ominous | |
| opprobrious(adjective, hateful, abusive) | |
| ornery(adjective, mean, nasty, vicious, unfriendly) | |
| pestiferous(bad, injurious, damaging, deadly, fatal) | |
| pitiless(adjective, animal, mean, cruel, vicious) | |
| quarrelsome(adjective, nasty, cold, hostile, aloof) | |
| resentful(adjective, mean, nasty, hostile, hateful) | |
| risky(adjective, bad, heavy, dangerous, injurious) | |
| ruthless(adjective, animal, mean, violent, cruel) | |
| sarcastic(adjective, mean, vicious, spiteful) | |
| severe(adjective, dangerous) | |
| slanderous | |
| sour(adjective, mean, nasty, cold, hostile) | |
| suicidal | |
| sullen(adjective, malevolent) | |
| tumorous | |
| uncharitable(adjective, mean, nasty, cold, ill) | |
| uncivilised |
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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> |