Synonyms|28Antonyms|0|Broader|0Narrower|0Related|0
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adamant(adjective, strong, hard, tough)
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adamantine(adjective, strong, hard, tough)
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dense(adjective, strong, hard, tough)
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determined(adjective, strong, hard, tough)
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ferric(adjective, strong, hard, tough)
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ferrous(adjective, strong, hard, tough)
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firm(adjective, strong, hard, tough)
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hard(adjective, strong, tough)
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hard as nails(expression, adjective, idiom, strong, hard)
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heavy(adjective, strong, hard, tough)
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immovable(adjective, strong, hard, tough)
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implacable(adjective, strong, hard, tough)
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indomitable(adjective, strong, hard, tough)
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inexorable(adjective, strong, hard, tough)
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insensible(adjective, strong, hard, tough)
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iron(strong, hard, tough)
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obdurate(adjective, strong, hard, tough)
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relentless(adjective, strong, hard, tough)
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rigid(adjective, strong, hard, tough)
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robust(adjective, strong, hard, tough)
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APASmart Define. (-0001). rock hard thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/rock_hard/thesaurus/synonyms
ChicagoSmart Define. -0001. "rock hard thesaurus" https://smartdefine.org/rock_hard/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define -0001, rock hard thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/rock_hard/thesaurus/synonyms>.
MLASmart Define. "rock hard thesaurus" 30 November -0001. Web. 20 September 2026. <https://smartdefine.org/rock_hard/thesaurus/synonyms>