| feral | |
| ferocious(adjective, animal, mean, cruel, vicious) | |
| fierce(adjective, animal, mean, cruel, vicious) | |
| full of hate(expression, idiom) | |
| gangrenous(adjective, unhealthy) | |
| ghoulish | |
| grim(adjective, animal, mean, dark, violent) | |
| hellish(adjective, nasty, vicious, wicked, hateful) | |
| horrible(adjective, mean, vicious, spiteful) | |
| horrid(mean, malicious, vindictive) | |
| inauspicious(adjective, evil, nasty, cold, hostile) | |
| infected(adjective, unhealthy) | |
| infectious | |
| infective | |
| infernal | |
| inhospitable(adjective, mean, nasty, cold, hostile) | |
| invidious | |
| killing | |
| menacing(adjective, bad, evil, heavy, dangerous) | |
| merciless(adjective, mean, cruel, vicious, hateful) |
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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> |