266 entries under firm topic. ×

4
sound(adjective, clear, strong, hard, secure)
4
stony(adjective, hard, solid, stiff)
4
wedged(true, constant, steadfast, immovable)
3
congealed(verb, adjective, set, hard)
3
constrained(verb, true, definite, constant)
3
dependable(adjective, set, strong, tough)
3
guaranteed(verb, adjective, set, clear, sound)
3
indubitable(adjective, clear, total, solid)
3
jelled(adjective, set, solid, heavy)
3
loyal(adjective, strong, solid, true)
3
on ice(expression, adjective, clear, solid)
3
ossified(adjective, set, solid, heavy)
3
pigheaded(adjective, mean, hard, tough)
3
refractory(adjective, hard, tough, rough)
3
steely(adjective, hard, solid, rigid)
3
strong-willed(adjective, determined, serious, resolute)
3
sturdy(adjective, close, strong, hard, sound)
3
thick(adjective, strong, hard, solid)
3
undoubted(adjective, clear, sound, plain)
3
unquestioning(adjective, set, clear, solid)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 23 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>