54 entries under callous topic. ×

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harsh(adjective, tough, cruel, grim, unfeeling)
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impassive(adjective, hard, insensitive, unexcitable)
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indifferent(adjective, unkind, unresponsive, crass)
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inexcitable(adjective, unexcitable, hard-as-nails)
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inhuman(adjective, cruel, unfeeling, insensitive)
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matter of fact(expression, adjective, idiom, unfeeling)
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merciless(adjective, cruel, vicious, unfeeling, pitiless)
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poker-faced(adjective, unexcitable, hard-as-nails)
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ruthless(adjective, cruel, vicious, unfeeling, brutal)
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savage(adjective, cruel, vicious, unfeeling, pitiless)
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uncompassionate(adjective, cruel, unfeeling, insensitive)
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unemotional(adjective, cruel, unfeeling, insensitive)
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unimpressible(adjective, stiff, unfeeling, hard-hearted)
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unsympathetic(adjective, tough, harsh, cruel, grim)
<123>
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APASmart Define. (2015). hard as nails thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/hard_as_nails/thesaurus/synonyms
ChicagoSmart Define. 2015. "hard as nails thesaurus" https://smartdefine.org/hard_as_nails/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, hard as nails thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>.
MLASmart Define. "hard as nails thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/hard_as_nails/thesaurus/synonyms>