67 entries under toughened topic. ×

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hard-nosed(adjective, hard, unfeeling, unsympathetic, hardened)
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impenitent(adjective, hard, unfeeling, unsympathetic, hardened)
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insentient(adjective, hard, unfeeling, unsympathetic, hardened)
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stiff(adjective, hard, unfeeling, unsympathetic, frosty)
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torpid(adjective, dull, hard, slow, unfeeling)
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unaffected(adjective, hard, unfeeling, unsympathetic, unresponsive)
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unsentimental(adjective, cynical, hard-boiled, hard-bitten)
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APASmart Define. (2016). coldhearted thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/coldhearted/thesaurus/synonyms
ChicagoSmart Define. 2016. "coldhearted thesaurus" https://smartdefine.org/coldhearted/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, coldhearted thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/coldhearted/thesaurus/synonyms>.
MLASmart Define. "coldhearted thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/coldhearted/thesaurus/synonyms>