| unwholesome(adjective, rotten, harmful, poisonous, toxic) | |
| catastrophic(adjective, grave, harmful, injurious, damaging) | |
| cutthroat(adjective, unpleasant, grim, harmful, injurious) | |
| fell(adjective, unpleasant, grim, harmful, injurious) | |
| feral | |
| hazardous(adjective, risky, dangerous, unsafe) | |
| killing | |
| life-threatening(adjective, dangerous) | |
| mischievous | |
| risky(adjective, dangerous, unsafe) | |
| unhealthy(adjective, risky, harmful, killing, dangerous) | |
| ominous | |
| corrupting(harmful, poisonous, toxic) | |
| dead(adjective, killing) | |
| death-dealing | |
| hopeless | |
| incurable | |
| insecure(adjective, risky, dangerous, unsafe) | |
| menacing(adjective, risky, dangerous, unsafe) | |
| noisome(adjective, bad, evil, harmful, injurious) |
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| APA | Smart Define. (2015). lethal thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/lethal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "lethal thesaurus" https://smartdefine.org/lethal/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, lethal thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/lethal/thesaurus/synonyms>. |
| MLA | Smart Define. "lethal thesaurus" 17 July 2015. Web. 20 September 2026. <https://smartdefine.org/lethal/thesaurus/synonyms> |