127 entries under tough topic. ×

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herculean(adjective, rough, difficult, heavy)
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immovable(adjective, strong, hard, sturdy)
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insensible(adjective, strong, hard, sturdy)
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robust(adjective, strong, hard, sturdy)
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steel(adjective, strong, hard, sturdy)
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thick(adjective, strong, hard, sturdy)
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tough inflexible(expression, strong, hard, sturdy)
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APASmart Define. (2016). serious thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 30 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>