Synonyms|214Antonyms|55|Broader|1Narrower|5Related|92
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maliciousness(noun, cruelty, coldness, viciousness, callousness)
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mettle
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miserliness(noun, cruelty, unkindness, spitefulness, callousness)
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mulishness(ruthlessness, pitilessness, mercilessness, relentlessness)
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nerve
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obduracy(ruthlessness, pitilessness, mercilessness, relentlessness)
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obdurateness(ruthlessness, pitilessness, mercilessness, relentlessness)
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obstinacy(ruthlessness, pitilessness, mercilessness, relentlessness)
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parsimony(noun, cruelty, unkindness, spitefulness, callousness)
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pertinacity(ruthlessness, pitilessness, mercilessness, relentlessness)
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pettiness(noun, cruelty, unkindness, spitefulness, callousness)
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pigheadedness(ruthlessness, pitilessness, mercilessness, relentlessness)
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pluck
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rancorousness
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rapacity(noun, cruelty, unkindness, spitefulness, callousness)
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remorselessness(coldness, hardheartedness, pitilessness, mercilessness, relentlessness)
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resolution
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rigidity(ruthlessness, pitilessness, mercilessness, relentlessness)
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rigidness(ruthlessness, pitilessness, mercilessness, relentlessness)
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savagism
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APASmart Define. (2015). heartlessness thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/heartlessness/thesaurus/synonyms
ChicagoSmart Define. 2015. "heartlessness thesaurus" https://smartdefine.org/heartlessness/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, heartlessness thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/heartlessness/thesaurus/synonyms>.
MLASmart Define. "heartlessness thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/heartlessness/thesaurus/synonyms>