Synonyms|61Antonyms|0|Broader|0Narrower|0Related|0
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relentless(strong, hard, tough, sturdy, rigid)
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rigid(strong, hard, tough, sturdy, rugged)
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rigorous(strong, hard, tough, sturdy, rugged)
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robust(strong, hard, tough, sturdy, rigid)
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rock hard(expression, strong, hard, tough)
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rough(strong, hard, tough, sturdy, rugged)
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rugged(strong, hard, tough, sturdy)
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serious(strong, hard, tough, sturdy, rugged)
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severe(strong, hard, tough, sturdy, rugged)
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steel(strong, hard, tough, sturdy, rigid)
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steely(strong, hard, tough, sturdy, rigid)
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stiff-necked(strong, hard, tough, sturdy, rugged)
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strict(strong, hard, tough, sturdy, rugged)
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strong(hard, tough, sturdy, rigid, rugged)
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sturdy(strong, hard, tough, rugged)
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thick(strong, hard, tough, sturdy, rigid)
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tough(strong, hard, sturdy, rugged)
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unbending(strong, hard, tough, sturdy, rigid)
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unrelenting(strong, hard, tough, sturdy, rugged)
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unsparing(strong, hard, tough, sturdy, rugged)
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APASmart Define. (1970). tough inflexible thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/tough_inflexible/thesaurus/synonyms
ChicagoSmart Define. 1970. "tough inflexible thesaurus" https://smartdefine.org/tough_inflexible/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 1970, tough inflexible thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>.
MLASmart Define. "tough inflexible thesaurus" 1 January 1970. Web. 1 October 2026. <https://smartdefine.org/tough_inflexible/thesaurus/synonyms>