| fate | |
| ferocious | |
| fierce | |
| firing squad(expression, idiom, punishment, scourge) | |
| formidable(adjective, dangerous) | |
| gas chamber(noun, expression, idiom, punishment, scourge) | |
| grave(adjective, dangerous) | |
| high-flying(adjective, successful) | |
| homicidally | |
| huge(adjective, successful) | |
| human | |
| impending(adjective, dangerous) | |
| infective | |
| inhuman | |
| insalubrious(adjective, harmful, unwholesome, poisonous, toxic) | |
| killer | |
| leading(adjective, successful) | |
| lethally | |
| lethiferous(adjective, harmful, killing, injurious, damaging) | |
| lost |
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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> |