Synonyms|214Antonyms|55|Broader|1Narrower|5Related|92
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bullheadedness(ruthlessness, pitilessness, mercilessness, relentlessness)
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callosity
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cannibalism
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churlishness(noun, cruelty, unkindness, spitefulness, callousness)
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closeness(noun, cruelty, unkindness, spitefulness, callousness)
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cold-heartedness(cruelty, insensitivity, coldness, viciousness, hardheartedness)
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contemptibleness(noun, cruelty, unkindness, spitefulness, callousness)
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contumacy(ruthlessness, pitilessness, mercilessness, relentlessness)
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corruptness(noun, cruelty, unkindness, spitefulness, callousness)
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covetousness(noun, cruelty, unkindness, spitefulness, callousness)
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cruelness
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debasement(noun, cruelty, unkindness, spitefulness, callousness)
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degeneracy(noun, cruelty, unkindness, spitefulness, callousness)
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degradation(noun, cruelty, unkindness, spitefulness, callousness)
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determination
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die-hardism(ruthlessness, pitilessness, mercilessness, relentlessness)
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disrepute(noun, cruelty, unkindness, spitefulness, callousness)
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doggedness(ruthlessness, pitilessness, mercilessness, relentlessness)
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ferocious
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fiercer
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APASmart Define. (2015). heartlessness thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/heartlessness/thesaurus/synonyms
ChicagoSmart Define. 2015. "heartlessness thesaurus" https://smartdefine.org/heartlessness/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, heartlessness thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/heartlessness/thesaurus/synonyms>.
MLASmart Define. "heartlessness thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/heartlessness/thesaurus/synonyms>