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unyielding(adjective, strong, tough, sturdy)
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APASmart Define. (2013). ferric thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/ferric/thesaurus/synonyms
ChicagoSmart Define. 2013. "ferric thesaurus" https://smartdefine.org/ferric/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2013, ferric thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/ferric/thesaurus/synonyms>.
MLASmart Define. "ferric thesaurus" 17 June 2013. Web. 27 September 2026. <https://smartdefine.org/ferric/thesaurus/synonyms>