Synonyms|28Antonyms|0|Broader|0Narrower|0Related|0
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steel(adjective, strong, hard, tough)
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steely(adjective, strong, hard, tough)
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strong(adjective, hard, tough)
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thick(adjective, strong, hard, tough)
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tough(adjective, strong, hard)
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tough inflexible(expression, strong, hard, tough)
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unbending(adjective, strong, hard, tough)
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unyielding(adjective, strong, hard, tough)
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APASmart Define. (-0001). rock hard thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rock_hard/thesaurus/synonyms
ChicagoSmart Define. -0001. "rock hard thesaurus" https://smartdefine.org/rock_hard/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define -0001, rock hard thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rock_hard/thesaurus/synonyms>.
MLASmart Define. "rock hard thesaurus" 30 November -0001. Web. 25 September 2026. <https://smartdefine.org/rock_hard/thesaurus/synonyms>