| uninterested(adjective, indifferent, detached, distant, apathetic) | |
| unmoved(adjective, mean, hard, cool, unpleasant) | |
| unsympathizing(mean, unkind) | |
| vindictive(adjective, mean, severe, nasty, harsh) | |
| violent | |
| virulent(adjective, evil, nasty, harsh, vicious) | |
| wanton(adjective, mean, severe, harsh, cruel) | |
| wild(adjective, rude, violent, cruel, vicious) | |
| accustomed(adjective, hard, unfeeling, unsympathetic, hardened) | |
| adamantine | |
| along for the ride(expression, adjective, idiom, detached, impassive) | |
| amoral(adjective, wicked) | |
| anaesthetised | |
| antipathetic(adjective, mean, hard, cool, unpleasant) | |
| arctic | |
| asleep(adjective, hard, tough, severe, cruel) | |
| autistic | |
| aversive(adjective, mean, hard, cool, unpleasant) | |
| awful(adjective, wicked) | |
| barbarian(adjective, rude, violent, cruel, vicious) |
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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> |