74 entries under adverb topic. ×

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