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hard as nails(adjective, idiom, strong, hard)
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tough inflexible(strong, hard, tough)
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APASmart Define. (-0001). rock hard thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rock_hard/thesaurus/synonyms
ChicagoSmart Define. -0001. "rock hard thesaurus" https://smartdefine.org/rock_hard/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define -0001, rock hard thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rock_hard/thesaurus/synonyms>.
MLASmart Define. "rock hard thesaurus" 30 November -0001. Web. 22 September 2026. <https://smartdefine.org/rock_hard/thesaurus/synonyms>