92 entries under inflexible topic. ×

49
substantial(adjective, characteristic, calm, good, close)
45
firm(noun, adjective, calm, good, close)
29
thick(adjective, characteristic, person, close, body)
28
hard(adjective, adverb, person, body, strong)
26
sturdy(adjective, calm, person, body, strong)
25
stable(adjective, good, strong, hard, sound)
22
dense(adjective, characteristic, person, set, body)
20
concrete(adjective, set, hard, tough, correct)
15
rigid(adjective, strong, hard, complete, secure)
15
tough(adjective, calm, person, body, strong)
15
stiff(adjective, set, strong, hard, secure)
14
compact(adjective, close, set, hard, tough)
12
fixed(adjective, set, strong, hard, sound)
11
heavy(adjective, characteristic, person, set, body)
11
close(adjective, set, hard, tough, correct)
11
impenetrable(adjective, close, set, hard, tough)
11
tight(adjective, adverb, good, close, strong)
10
compressed(adjective, set, hard, tough, firm)
10
concentrated(adjective, set, hard, complete, tough)
10
set(adjective, calm, strong, hard, secure)
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APASmart Define. (2016). solid thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/solid/thesaurus/synonyms
ChicagoSmart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, solid thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>.
MLASmart Define. "solid thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms>