| malefic | |
| malevolent | |
| mephitic | |
| miasmatic | |
| mortiferous(adjective, killing, deadly) | |
| nasty(adjective, dangerous) | |
| nocuous | |
| perishable | |
| prejudicial | |
| pressing(adjective, dangerous) | |
| sanguineous(adjective, murderous) | |
| scatheful | |
| serious(adjective, dangerous) | |
| severe(adjective, dangerous) | |
| slaughterous(adjective, grim, harmful, injurious, damaging) | |
| terrible(adjective, dangerous) | |
| terrifying(adjective, dangerous) | |
| thriving(adjective, successful) | |
| toxicant(adjective, poisonous) | |
| treacherous(adjective, dangerous) |
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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> |