57 entries under tough topic. ×

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ferrous(adjective, strong, hard, sturdy)
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hard(adjective, strong, severe, harsh)
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heavy(adjective, strong, hard, sturdy)
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immovable(adjective, strong, hard, sturdy)
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implacable(adjective, strong, hard, severe)
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inflexible(adjective, strong, hard, severe)
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insensible(adjective, strong, hard, sturdy)
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obdurate(adjective, strong, hard, sturdy)
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rigorous(adjective, strong, hard, severe)
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robust(adjective, strong, hard, sturdy)
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rugged(adjective, strong, hard, severe)
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steel(adjective, strong, hard, sturdy)
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strong(adjective, hard, sturdy, rugged)
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sturdy(adjective, strong, hard, rugged)
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thick(adjective, strong, hard, sturdy)
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tough inflexible(expression, strong, hard, sturdy)
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unbending(adjective, strong, hard, sturdy)
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APASmart Define. (2013). hard-shell thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/hard-shell/thesaurus/synonyms
ChicagoSmart Define. 2013. "hard-shell thesaurus" https://smartdefine.org/hard-shell/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2013, hard-shell thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/hard-shell/thesaurus/synonyms>.
MLASmart Define. "hard-shell thesaurus" 17 June 2013. Web. 25 September 2026. <https://smartdefine.org/hard-shell/thesaurus/synonyms>