| pestiferous(adjective, bad, evil, harmful, injurious) | |
| precarious(adjective, risky, dangerous, unsafe) | |
| septic | |
| threatening(adjective, risky, dangerous, unsafe) | |
| wicked(adjective, bad, risky, dangerous, deadly) | |
| vicious | |
| acute(adjective, dangerous) | |
| alarming(adjective, dangerous) | |
| annihilative(adjective, harmful, injurious, damaging, deadly) | |
| bad | |
| barbarous | |
| big(adjective, successful) | |
| bloodthirsty | |
| bloody | |
| brilliant(adjective, successful) | |
| calamitous(adjective, grave, harmful, injurious, damaging) | |
| cancerous(adjective, harmful, injurious, damaging, deadly) | |
| cataclysmic(adjective, grave, harmful, injurious, damaging) | |
| consumptive(adjective, harmful, injurious, damaging, deadly) | |
| corroding |
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| APA | Smart Define. (2015). lethal thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/lethal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "lethal thesaurus" https://smartdefine.org/lethal/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, lethal thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/lethal/thesaurus/synonyms>. |
| MLA | Smart Define. "lethal thesaurus" 17 July 2015. Web. 21 September 2026. <https://smartdefine.org/lethal/thesaurus/synonyms> |