66 entries under toughened topic. ×

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unconcerned(adjective, hard, unfeeling, unsympathetic, hardened)
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unimpressionable(adjective, hard, unfeeling, unsympathetic, hardened)
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unresponsive(adjective, hard, unfeeling, unsympathetic, hardened)
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unsentimental(adjective, cynical, hard-boiled, hard-bitten)
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unsusceptible(adjective, hard, unfeeling, unsympathetic, hardened)
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unsympathetic(adjective, hard, unfeeling, hardened)
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APASmart Define. (2015). inaccessible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/inaccessible/thesaurus/synonyms
ChicagoSmart Define. 2015. "inaccessible thesaurus" https://smartdefine.org/inaccessible/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, inaccessible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/inaccessible/thesaurus/synonyms>.
MLASmart Define. "inaccessible thesaurus" 20 November 2015. Web. 30 September 2026. <https://smartdefine.org/inaccessible/thesaurus/synonyms>