136 entries under firm topic. ×

10
equable(adjective, calm, quiet, smooth, soft)
10
even(adjective, adverb, calm, quiet, smooth)
10
immutable(adjective, dull, secure, steady)
10
regular(adjective, calm, quiet, smooth, right)
10
unvarying(adjective, calm, quiet, smooth, right)
9
calm(adjective, quiet, sound, smooth, reasonable)
9
resolute(adjective, strong, secure, easy, flat)
9
safe(adjective, good, strong, complete, secure)
9
tough(adjective, strong, sound, heavy)
8
abiding(adjective, quality, strong, tough, flat)
8
changeless(adjective, smooth, right, solid)
7
certain(adjective, good, strong, easy)
7
faithful(adjective, good, strong, sound)
6
stalwart(adjective, strong, sound, tough)
6
true(adjective, good, strong, smooth, right)
5
anchored(adjective, strong, secure, solid)
5
poised(adjective, calm, quiet, easy)
5
sensible(adjective, sound, reasonable, moderate)
5
tenacious(adjective, strong, sound, secure, tough)
5
unswerving(adjective, solid, fixed, resolute)
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APASmart Define. (2015). stable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>