Synonyms|95Antonyms|1|Broader|0Narrower|0Related|7

60 entries under strong topic. ×

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obdurate(adjective, hard, tough, sturdy)
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relentless(adjective, hard, tough, sturdy)
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rigid(adjective, hard, tough, sturdy)
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rigorous(adjective, hard, tough, sturdy)
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robust(adjective, hard, tough, sturdy)
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rock hard(expression, adjective, hard, tough)
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rough(adjective, hard, tough, sturdy)
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rugged(adjective, hard, tough, sturdy)
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serious(adjective, hard, tough, sturdy)
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severe(adjective, hard, tough, sturdy)
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stiff-necked(adjective, hard, tough, sturdy)
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strict(adjective, hard, tough, sturdy)
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sturdy(adjective, hard, tough, rugged)
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thick(adjective, hard, tough, sturdy)
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tough(adjective, hard, sturdy, rugged)
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tough inflexible(expression, adjective, hard, tough)
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unbending(adjective, hard, tough, sturdy)
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unrelenting(adjective, hard, tough, sturdy)
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unsparing(adjective, hard, tough, sturdy)
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unyielding(adjective, hard, tough, sturdy)
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APASmart Define. (2015). ferrous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/ferrous/thesaurus/synonyms
ChicagoSmart Define. 2015. "ferrous thesaurus" https://smartdefine.org/ferrous/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, ferrous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/ferrous/thesaurus/synonyms>.
MLASmart Define. "ferrous thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/ferrous/thesaurus/synonyms>