Synonyms|127Antonyms|52|Broader|0Narrower|0Related|569

31 entries under hard topic. ×

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hard as nails(expression, adjective, idiom, strong)
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hardened(adjective, strong, firm, solid)
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hardy(adjective, strong, solid, stiff)
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healthy(adjective, strong, solid, stiff)
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indigestible(adjective, strong, solid, stiff)
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leathery(adjective, strong, solid, stiff)
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lusty(adjective, strong, solid, stiff)
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seasoned(adjective, strong, solid, stiff)
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steeled(adjective, strong, solid, stiff)
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tough as nails(expression, adjective, idiom, strong)
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withstanding(adjective, strong, solid, stiff)
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ChicagoSmart Define. 2016. "unbreakable thesaurus" https://smartdefine.org/unbreakable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unbreakable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unbreakable/thesaurus/synonyms>.
MLASmart Define. "unbreakable thesaurus" 5 January 2016. Web. 25 September 2026. <https://smartdefine.org/unbreakable/thesaurus/synonyms>