| base(adjective, wicked) | |
| blank(adjective, cool, detached, sober, unfeeling) | |
| blind to(verb, expression, adjective, phrasal verb, hard) | |
| bowed-down | |
| bowelless | |
| brassy | |
| brazen | |
| brutality | |
| calloused | |
| callused | |
| cantankerous(adjective, hard, tough, severe, cruel) | |
| careless(adjective, hard, indifferent, cruel, apathetic) | |
| cast down | |
| catatonic | |
| churlish(adjective, hard, tough, severe, cruel) | |
| cold as charity(expression, idiom) | |
| cold blooded(adjective, aloof, unfeeling, senseless) | |
| cold of heart(expression, idiom) | |
| collected(adjective, cool, blank, aloof, unemotional) | |
| comatose |
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| APA | Smart Define. (2016). heartless thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/heartless/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "heartless thesaurus" https://smartdefine.org/heartless/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, heartless thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/heartless/thesaurus/synonyms>. |
| MLA | Smart Define. "heartless thesaurus" 24 March 2016. Web. 24 September 2026. <https://smartdefine.org/heartless/thesaurus/synonyms> |