| bad(adjective, wicked, injurious, damaging, destructive) | |
| belligerent(adjective, mean, nasty, unfriendly, hateful) | |
| corrupting(harmful, injurious, damaging, destructive, inexpedience) | |
| deathly | |
| grim | |
| infectious(adjective, catching, spreading) | |
| malefic(adjective, injurious, damaging, deadly, destructive) | |
| mischievous(adjective, mean, nasty, wicked, hateful) | |
| mortal | |
| noisome(unhealthy, harmful, injurious, noxious, poisonous) | |
| pestiferous(adjective, unhealthy, harmful, injurious, annoying) | |
| sour(adjective, mean, severe, nasty, hostile) | |
| stringent(adjective, physical energy) | |
| sulfurous | |
| tart | |
| unkind(adjective, mean, evil, nasty, harsh) | |
| unpleasant | |
| acidic | |
| acute | |
| barbarous(adjective, evil, nasty, harsh, vicious) |
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| APA | Smart Define. (2015). virulent thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/virulent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "virulent thesaurus" https://smartdefine.org/virulent/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, virulent thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/virulent/thesaurus/synonyms>. |
| MLA | Smart Define. "virulent thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/virulent/thesaurus/synonyms> |