101 entries under fixed topic. ×

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tough nut(expression, determined, steady, impassive)
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unfluctuating(adjective, normal, even, constant)
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wrong-headed(determined, stubborn)
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ageless(unchanging, permanent, static, unchangeable)
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continuing(static, unvarying, unchangeable, unalterable)
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contradictory(determined, stubborn, conflicting, incompatible)
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cynical(adjective, set, hard, unfeeling)
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equable(adjective, even, rigid, reliable)
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eternal(static, unchangeable)
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heady(determined, stubborn)
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imperishable(static, unchangeable)
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lasting(static, unchangeable)
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opinionative(determined, stubborn)
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permanent(steady, unchanging, static, unvarying)
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perpetual(set, regular, constant, rigid)
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restive(determined, stubborn)
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same(set, regular, constant, rigid)
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stabile(static, unchangeable)
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unchanged(static, unvarying, unchangeable, unalterable)
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unfading(static, unchangeable)
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APASmart Define. (2016). inflexible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>