87 entries under rigid topic. ×

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dyed-in-the-wool(adjective, close, set, strong, hard)
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convincing(adjective, severe, harsh, stiff)
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drawing(adjective, severe, harsh, stiff)
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pigheaded(obstinate, stern, stubborn, unbending)
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poignant(adjective, severe, harsh, stiff)
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unadaptable(hard, inflexible, obstinate, stubborn)
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uncompliant(hard, inflexible, obstinate, stubborn)
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APASmart Define. (2015). strict thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/strict/thesaurus/synonyms
ChicagoSmart Define. 2015. "strict thesaurus" https://smartdefine.org/strict/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, strict thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/strict/thesaurus/synonyms>.
MLASmart Define. "strict thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/strict/thesaurus/synonyms>