5
deep(verb, adjective, set, sound, heavy)
5
fine(adjective, good, great, pleasant, excellent)
5
holistic(adjective, simple, whole, united)
5
immobile(adjective, strong, secure, fixed, impassive)
5
irreducible(adjective, simple, whole, united)
5
irrefutable(adjective, sound, reasonable, material, certain)
5
jam-packed(adjective, close, strong, short, substantial)
5
jelled(adjective, set, hard, tough, firm)
5
law-abiding(adjective, pure, real, genuine, reliable)
5
lump(noun, block, bar, piece, mass)
5
permanent(adjective, calm, strong, secure, steady)
5
persistent(adjective, strong, tough, firm, certain)
5
rational(sound, reasonable, useful, realistic, forceful)
5
reasonable(sound, rational, suitable, useful, acceptable)
5
resistant(adjective, strong, hard, tough, fit)
5
same(adjective, simple, whole, united)
5
satisfactory(adjective, good, clear, great, reasonable)
5
self-colored
5
solidness
5
stationary(adjective, calm, strong, fixed, constant)
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APASmart Define. (2016). solid thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/solid/thesaurus/synonyms
ChicagoSmart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, solid thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>.
MLASmart Define. "solid thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms>