| unsalutary(adjective, unwholesome) | |
| untidy(adjective, unclean) | |
| urgent(adjective, dangerous) | |
| venenate | |
| veneniferous | |
| venenous | |
| vermicide | |
| vicious | |
| viperous | |
| virus | |
| vulnerable(adjective, dangerous) | |
| wicked(adjective, dangerous) | |
| wrackful(adjective, harmful, injurious, damaging, deadly) | |
| wreckful(adjective, harmful, injurious, damaging, deadly) | |
| narcotic(adjective, insalubrity) | |
| azotic | |
| unstable(adjective, dangerous) | |
| acerb | |
| active | |
| adverse(injurious, damaging, destructive) |
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| APA | Smart Define. (2015). toxic thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/toxic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "toxic thesaurus" https://smartdefine.org/toxic/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, toxic thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/toxic/thesaurus/synonyms>. |
| MLA | Smart Define. "toxic thesaurus" 17 July 2015. Web. 23 September 2026. <https://smartdefine.org/toxic/thesaurus/synonyms> |