9
cruelly(adverb, fiercely, violently, unkindly, viciously)
8
callously(adverb, fiercely, cruelly, indifferently, viciously)
8
ruthlessly(adverb, immorality, acts, insensitively)
7
grimly(adverb, in a bad way)
7
indifferently(adverb, deliberately, cruelly, coldly, insensitively)
7
unfeelingly(adverb, harshly, cruelly, unkindly, indifferently)
7
unsympathetically(adverb, immorality, acts, insensitively)
6
mercilessly(adverb, cruel, evil way)
6
pitilessly(adverb, cruel, evil way)
6
unkindly(adverb, cruel, in a bad way, evil way)
5
hardheartedly(adverb, fiercely, cruelly, viciously, insensitively)
5
in cold blood(expression, idiom, adverb, cruel, manner)
4
coldly(adverb, deliberately, cruelly, unkindly, indifferently)
4
harshly
3
aloofly(adverb, insensitively, in a bad way)
3
apathetically(adverb, insensitively)
3
coldheartedly(adverb, in a bad way)
3
dispassionately(adverb, insensitively)
3
inexorably(adverb, cruel, evil way)
3
inhumanly(adjective, adverb, cruel, evil way)
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APASmart Define. (2016). heartlessly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/heartlessly/thesaurus/synonyms
ChicagoSmart Define. 2016. "heartlessly thesaurus" https://smartdefine.org/heartlessly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, heartlessly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/heartlessly/thesaurus/synonyms>.
MLASmart Define. "heartlessly thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/heartlessly/thesaurus/synonyms>