28 entries under firm topic. ×

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iron(adjective, set, strong, hard)
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rigid(adjective, set, strong, hard)
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rocky(adjective, set, strong, hard)
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stiff(adjective, set, strong, hard)
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stony(adjective, set, strong, hard)
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tough(adjective, stiff, rigid, stubborn)
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unbreakable(adjective, stiff, rigid)
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unyielding(adjective, hard, stiff, compact)
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APASmart Define. (2015). compacted thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/compacted/thesaurus/synonyms
ChicagoSmart Define. 2015. "compacted thesaurus" https://smartdefine.org/compacted/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, compacted thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/compacted/thesaurus/synonyms>.
MLASmart Define. "compacted thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/compacted/thesaurus/synonyms>