Synonyms|404Antonyms|106|Broader|1Narrower|0Related|115

46 entries under stiff topic. ×

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molded(adjective, strong, hard, solid)
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resilient(adjective, strong, hard, solid)
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tight(adjective, strong, hard, solid)
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unbreakable(adjective, strong, hard, firm, solid)
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unimpressible(adjective, unfeeling, callous, hard-hearted)
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withstanding(adjective, strong, hard, solid)
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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>