117 entries under firm topic. ×

10
equable(adjective, calm, solid, steady)
10
persistent(adjective, certain, steady, stable)
10
resolute(adjective, close, hard, correct, severe)
10
set(verb, adjective, severe, harsh)
10
undeviating(adjective, smooth, right, severe, flat)
8
inflexible(adjective, moderate, severe, harsh)
6
unfluctuating(adjective, calm, smooth, right, flat)
5
certain(adjective, set, clear, solid)
5
decided(adjective, clear, certain, definite)
5
durable(adjective, set, solid, steady)
5
fast(adjective, close, correct, honest)
5
stabile(adjective, calm, smooth, right, flat)
5
sure(adjective, close, set, clear, correct)
4
definite(adjective, clear, severe, harsh)
4
obstinate(moderate, cautious, conventional, timid)
4
settled(adjective, strong, solid, determined)
4
solid(adjective, severe, harsh, certain)
4
staunch(adjective, close, correct, honest)
4
straight(adjective, close, smooth, correct, right)
4
strong(adjective, steady, even, unyielding)
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APASmart Define. (2015). unchanging thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unchanging/thesaurus/synonyms
ChicagoSmart Define. 2015. "unchanging thesaurus" https://smartdefine.org/unchanging/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unchanging thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unchanging/thesaurus/synonyms>.
MLASmart Define. "unchanging thesaurus" 10 November 2015. Web. 25 September 2026. <https://smartdefine.org/unchanging/thesaurus/synonyms>