119 entries under firm topic. ×

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bent(adjective, determined, usual, regular)
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brick-wall(adjective, solid, stable, fixed)
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close(true, fixed, constant, steadfast)
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concluded(adjective, determined, usual, regular)
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constrained(true, fixed, constant, steadfast)
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customary(adjective, determined, usual, regular)
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even(adjective, solid, stable, fixed)
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glued(true, fixed, constant, steadfast)
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hardboiled(adjective, rigid, iron, unmodifiable)
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held(true, fixed, constant, steadfast)
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impregnable(adjective, true, fixed, resolute)
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indelible(true, fixed, constant, steadfast)
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inextricable(true, fixed, constant, steadfast)
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intense(adjective, solid, stable, fixed)
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lasting(true, fixed, constant, established)
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levelheaded(adjective, solid, stable, fixed)
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liege(adjective, solid, intense, stable)
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patterned(adjective, solid, stable, fixed)
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poised(adjective, solid, stable, fixed)
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prearranged(adjective, determined, usual, regular)
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APASmart Define. (2015). immovable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/immovable/thesaurus/synonyms
ChicagoSmart Define. 2015. "immovable thesaurus" https://smartdefine.org/immovable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, immovable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/immovable/thesaurus/synonyms>.
MLASmart Define. "immovable thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/immovable/thesaurus/synonyms>