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selfishly(adverb, unkindly, indifferently, ungenerously)
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uncaringly(adverb, cruelly, unkindly, indifferently, coldly)
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unkindheartedly(adverb, negatively)
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unrelentingly
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unyieldingly
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APASmart Define. (2016). callously thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/callously/thesaurus/synonyms
ChicagoSmart Define. 2016. "callously thesaurus" https://smartdefine.org/callously/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, callously thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/callously/thesaurus/synonyms>.
MLASmart Define. "callously thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/callously/thesaurus/synonyms>