| unfavorable(adjective, mean, evil, nasty, cold) | |
| unsafe(adjective, bad, heavy, risky, dangerous) | |
| unsanitary(adjective, unhealthy) | |
| vile(adjective, mean, bad, offensive, corrupt) | |
| viperous(adjective, mean, bad, evil, nasty) | |
| Mephistophelian | |
| abject | |
| accidentally on purpose(expression, idiom, mean, nasty, malicious) | |
| acid | |
| acrid | |
| acute(adjective, dangerous) | |
| alarming(adjective, dangerous) | |
| alien(adjective, mean, nasty, cold, hostile) | |
| anaemic | |
| anemic | |
| anti(adjective, mean, nasty, unfriendly, hateful) | |
| antipathetic | |
| apoplectic | |
| appalling | |
| argumentative(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> |