| nasty(adjective, mean, bad, hard, cool) | |
| nonpartisan(adjective, indifferent, detached, distant, apathetic) | |
| undemonstrative(adjective, cool, detached, blank, sober) | |
| adamant(adjective, mean, hard, tough, harsh) | |
| brute | |
| carve | |
| deadly | |
| desensitized | |
| engrave | |
| homicidal | |
| intractable | |
| nonemotional(adjective, cool, detached, blank, sober) | |
| phlegmatic(adjective, cool, indifferent, detached, blank) | |
| rancorous(adjective, mean, evil, nasty, harsh) | |
| sanguinary | |
| spiteful(adjective, mean, evil, nasty, harsh) | |
| supine | |
| torpid(adjective, hard, careless, indifferent, cruel) | |
| truculent(adjective, harsh, rude, violent, cruel) | |
| uncompromising(adjective, mean, hard, tough, harsh) |
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| APA | Smart Define. (2016). heartless thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/heartless/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "heartless thesaurus" https://smartdefine.org/heartless/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, heartless thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/heartless/thesaurus/synonyms>. |
| MLA | Smart Define. "heartless thesaurus" 24 March 2016. Web. 23 September 2026. <https://smartdefine.org/heartless/thesaurus/synonyms> |