Synonyms|45Antonyms|21|Broader|0Narrower|0Related|38
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hardened(stiff, rigid, unbendable)
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hardheaded
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harsh
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headstrong
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heady
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immalleable(stiff, rigid, hardened, unbendable)
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impenetrable
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impliable(stiff, rigid, hardened, unbendable)
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inelastic(stiff, rigid, hardened, unbendable)
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relentless
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rigid
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rigorous
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rugged
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severe
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solid
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starched(stiff, rigid, hardened, unbendable)
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stern
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stiff
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strenuous
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stringent
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APASmart Define. (2013). nonflexible thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/nonflexible/thesaurus/synonyms
ChicagoSmart Define. 2013. "nonflexible thesaurus" https://smartdefine.org/nonflexible/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, nonflexible thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/nonflexible/thesaurus/synonyms>.
MLASmart Define. "nonflexible thesaurus" 19 May 2013. Web. 23 September 2026. <https://smartdefine.org/nonflexible/thesaurus/synonyms>