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hard as nails(expression, adjective, strong, hard)
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APASmart Define. (-0001). rock hard thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/rock_hard/thesaurus/synonyms
ChicagoSmart Define. -0001. "rock hard thesaurus" https://smartdefine.org/rock_hard/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define -0001, rock hard thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/rock_hard/thesaurus/synonyms>.
MLASmart Define. "rock hard thesaurus" 30 November -0001. Web. 27 September 2026. <https://smartdefine.org/rock_hard/thesaurus/synonyms>