| fire-eater | |
| firebrand | |
| fratricide | |
| fury | |
| gainer(noun, bad) | |
| gangster | |
| garroter | |
| gorilla | |
| greets(expression, idiom, informal, greeting) | |
| guerrilla(soldier, murderer, slayer) | |
| gun person(expression, soldier, guerrilla, murderer, slayer) | |
| gunfighter | |
| gunperson(noun, murderer) | |
| hangman | |
| hard-hearted(adjective, mean, severe, harsh, cruel) | |
| hardnose | |
| harmer(noun, bad) | |
| hatchet person(expression, soldier, guerrilla, murderer, slayer) | |
| heartless(adjective, mean, harsh, cruel, vicious) | |
| heavy |
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| APA | Smart Define. (2016). killer thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/killer/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "killer thesaurus" https://smartdefine.org/killer/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, killer thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/killer/thesaurus/synonyms>. |
| MLA | Smart Define. "killer thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/killer/thesaurus/synonyms> |