306 entries under firm topic. ×

3
clear(verb, adjective, sound, plain)
3
committed(adjective, deep, steady, fixed)
3
convinced(adjective, clear, certain, definite)
3
dedicated(adjective, solid, determined, steady)
3
enduring(adjective, calm, strong, secure, flat)
3
indubitable(adjective, clear, solid, certain)
3
iron(adjective, strong, tough, solid)
3
irrefutable(adjective, clear, sound, solid)
3
jellify(verb, form, develop, combine)
3
nailed(verb, adjective, calm, strong, secure)
3
on ice(expression, adjective, clear, solid)
3
ossified(adjective, hard, solid, heavy)
3
purposeful(adjective, strong, tough, determined)
3
refractory(adjective, hard, tough, solid)
3
reliable(adjective, calm, clear, strong, secure)
3
serious(adjective, strong, severe, thoughtful)
3
stiff-necked(adjective, usual, sure, constant)
3
stony(adjective, hard, solid, stiff)
3
strengthen(verb, support, hold, close, fix)
3
strong(adjective, calm, hard, tough, flat)
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APASmart Define. (2016). set thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/set/thesaurus/synonyms
ChicagoSmart Define. 2016. "set thesaurus" https://smartdefine.org/set/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, set thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/set/thesaurus/synonyms>.
MLASmart Define. "set thesaurus" 1 March 2016. Web. 23 September 2026. <https://smartdefine.org/set/thesaurus/synonyms>