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22 entries under solid topic. ×

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unbreakable(adjective, strong, hard, stiff)
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withstanding(adjective, strong, hard, stiff)
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APASmart Define. (2011). tough as nails thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tough_as_nails/thesaurus/synonyms
ChicagoSmart Define. 2011. "tough as nails thesaurus" https://smartdefine.org/tough_as_nails/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, tough as nails thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough_as_nails/thesaurus/synonyms>.
MLASmart Define. "tough as nails thesaurus" 24 May 2011. Web. 29 September 2026. <https://smartdefine.org/tough_as_nails/thesaurus/synonyms>