65 entries under toughened topic. ×

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cold-blooded(adjective, hard, unfeeling, unsympathetic, hardened)
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deaf to(expression, adjective, hard, unfeeling, unsympathetic)
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hard(adjective, strong, solid, stiff, unfeeling)
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hard-edged(adjective, cynical, hard-boiled, hard-bitten)
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hard-nosed(adjective, hard, unfeeling, unsympathetic, hardened)
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impassive(adjective, hard, unfeeling, unsympathetic, hardened)
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impenitent(adjective, hard, unfeeling, unsympathetic, hardened)
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indifferent(adjective, hard, unfeeling, unsympathetic, hardened)
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inflexible(adjective, strong, hard, solid, stiff)
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insensate(adjective, hard, unfeeling, unsympathetic, hardened)
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insensible(adjective, hard, unfeeling, unsympathetic, hardened)
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insensitive(adjective, hard, unfeeling, unsympathetic, hardened)
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insentient(adjective, hard, unfeeling, unsympathetic, hardened)
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soulless(adjective, hard, unfeeling, unsympathetic, hardened)
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spiritless(adjective, hard, unfeeling, unsympathetic, hardened)
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stiff(adjective, strong, hard, solid, unfeeling)
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stony(adjective, hard, unfeeling, unsympathetic, hardened)
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torpid(adjective, hard, unfeeling, unsympathetic, hardened)
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unaffected(adjective, hard, unfeeling, unsympathetic, hardened)
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unconcerned(adjective, hard, unfeeling, unsympathetic, hardened)
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APASmart Define. (2015). seasoned thesaurus. Retrieved October 2, 2026, from https://smartdefine.org/seasoned/thesaurus/synonyms
ChicagoSmart Define. 2015. "seasoned thesaurus" https://smartdefine.org/seasoned/thesaurus/synonyms (accessed October 2, 2026).
HarvardSmart Define 2015, seasoned thesaurus, Smart Define, viewed 2 October, 2026, <https://smartdefine.org/seasoned/thesaurus/synonyms>.
MLASmart Define. "seasoned thesaurus" 8 September 2015. Web. 2 October 2026. <https://smartdefine.org/seasoned/thesaurus/synonyms>