233 entries under solid topic. ×

4
unvarying(adjective, calm, clear, strong, secure)
3
bound(verb, adjective, control, check, strong)
3
coagulated(verb, adjective, heavy, deep)
3
dedicated(adjective, firm, determined, steady)
3
enduring(adjective, calm, strong, secure, flat)
3
indubitable(adjective, clear, firm, certain)
3
iron(adjective, strong, tough, firm)
3
irrefutable(adjective, clear, sound, firm)
3
nailed(verb, adjective, calm, strong, secure)
3
on ice(expression, adjective, clear, firm)
3
ossified(adjective, hard, firm, heavy)
3
refractory(adjective, hard, tough, firm)
3
reliable(adjective, calm, clear, strong, secure)
3
riveted(verb, adjective, strong, settle, establish)
3
stony(adjective, hard, firm, stiff)
3
strong(adjective, calm, hard, tough, flat)
3
substantial(adjective, calm, strong, hard, secure)
3
undeviating(adjective, strong, severe, flat, firm)
3
undoubted(adjective, clear, sound, firm)
3
unfaltering(adjective, firm, certain, steady)
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APASmart Define. (2016). set thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/set/thesaurus/synonyms
ChicagoSmart Define. 2016. "set thesaurus" https://smartdefine.org/set/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, set thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/set/thesaurus/synonyms>.
MLASmart Define. "set thesaurus" 1 March 2016. Web. 20 September 2026. <https://smartdefine.org/set/thesaurus/synonyms>