129 entries under firm topic. ×

3
immovable(adjective, solid, stable, fixed)
3
inexhaustible(adjective, strong, energetic, determined)
3
inflexible(adjective, strong, certain, limited)
3
regular(adjective, solid, steady, stable)
3
solid(adjective, steady, stable, fixed)
3
strong(adjective, determined, steady, bold)
3
strong-willed(adjective, intense, deliberate, determined)
3
unremitting(adjective, strong, energetic, determined)
2
calm(adjective, solid, stable, fixed)
2
continuing(adjective, strong, determined, steady)
2
decisive(adjective, certain, determined, serious)
2
even(adjective, solid, steady, stable)
2
intent(adjective, intense, certain, deliberate)
2
plodding(adjective, strong, determined, steady)
2
plugging(adjective, strong, determined, steady)
2
poised(adjective, solid, stable, fixed)
2
secure(adjective, solid, stable, fixed)
2
settled(adjective, solid, intense, certain)
2
strong-minded(adjective, certain, serious, resolute)
2
unbending(adjective, certain, limited, definite)
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APASmart Define. (2015). unfaltering thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unfaltering/thesaurus/synonyms
ChicagoSmart Define. 2015. "unfaltering thesaurus" https://smartdefine.org/unfaltering/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, unfaltering thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unfaltering/thesaurus/synonyms>.
MLASmart Define. "unfaltering thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/unfaltering/thesaurus/synonyms>