Synonyms|72Antonyms|1|Broader|0Narrower|0Related|8
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steely(adjective, strong, hard, tough, sturdy)
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stiff-necked(adjective, strong, hard, tough, sturdy)
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strict(adjective, strong, hard, tough, sturdy)
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strong(adjective, hard, tough, sturdy, rigid)
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sturdy(adjective, strong, hard, tough, rugged)
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thick(adjective, strong, hard, tough, sturdy)
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tough(adjective, strong, hard, sturdy, rugged)
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tough inflexible(expression, adjective, strong, hard, tough)
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unbending(adjective, strong, hard, tough, sturdy)
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unrelenting(adjective, strong, hard, tough, sturdy)
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unsparing(adjective, strong, hard, tough, sturdy)
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unyielding(adjective, strong, hard, tough, sturdy)
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APASmart Define. (2013). ferric thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/ferric/thesaurus/synonyms
ChicagoSmart Define. 2013. "ferric thesaurus" https://smartdefine.org/ferric/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, ferric thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/ferric/thesaurus/synonyms>.
MLASmart Define. "ferric thesaurus" 17 June 2013. Web. 23 September 2026. <https://smartdefine.org/ferric/thesaurus/synonyms>