102 entries under tough topic. ×

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hard-line(adjective, strong, hard, sturdy)
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hard-shell(adjective, strong, hard, sturdy)
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hard as nails(expression, adjective, idiom, strong, hard)
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hardheaded(adjective, strong, hard, sturdy)
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harsh(adjective, mean, strong, hard)
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immovable(adjective, strong, hard, sturdy)
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indomitable(adjective, strong, hard, sturdy)
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mortified(adjective, strong, hard, sturdy)
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mulish(adjective, strong, hard, sturdy)
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rigid(adjective, strong, hard, sturdy)
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rigorous(adjective, strong, hard, sturdy)
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robust(adjective, strong, hard, sturdy)
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rock hard(expression, adjective, strong, hard)
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serious(adjective, strong, hard, sturdy)
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steel(adjective, strong, hard, sturdy)
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stiff-necked(adjective, strong, hard, sturdy)
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strict(adjective, strong, hard, sturdy)
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strong(adjective, hard, sturdy, rigid)
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sturdy(adjective, strong, hard, rugged)
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tough inflexible(expression, strong, hard, sturdy)
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APASmart Define. (2015). insensible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/insensible/thesaurus/synonyms
ChicagoSmart Define. 2015. "insensible thesaurus" https://smartdefine.org/insensible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, insensible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/insensible/thesaurus/synonyms>.
MLASmart Define. "insensible thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/insensible/thesaurus/synonyms>