200 entries under solid topic. ×

1
self-possessed(adjective, calm, sound, firm)
1
serious(adjective, strong, big, important)
1
significant(proper, large, accepted, established)
1
sincere(adjective, good, strong, honest)
1
situated(adjective, secure, firm, steady)
1
solid as a rock(expression, adjective, idiom, strong, firm)
1
stark(adjective, strong, sound, tough)
1
strapping(adjective, strong, sound, tough)
1
tried-and-true(adjective, good, strong, honest)
1
unblemished(complete, clean, pure, vigorous)
1
undamaged(adjective, complete, clean, perfect)
1
undecayed(complete, clean, pure, vigorous)
1
unhurt(complete, clean, pure, vigorous)
1
unimpaired(complete, clean, pure, vigorous)
1
unmoving(adjective, calm, quiet, strong, secure)
1
unqualified(adjective, strong, flat, firm)
1
unshaken(adjective, strong, flat, firm)
1
weighty(adjective, strong, firm, important)
1
well(adjective, sound, complete, vigorous)
1
whole(complete, clean, pure, vigorous)
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APASmart Define. (2015). stable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/stable/thesaurus/synonyms
ChicagoSmart Define. 2015. "stable thesaurus" https://smartdefine.org/stable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, stable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/stable/thesaurus/synonyms>.
MLASmart Define. "stable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/stable/thesaurus/synonyms>