110 entries under rigid topic. ×

49
substantial(adjective, characteristic, calm, good, close)
45
firm(noun, adjective, calm, good, close)
31
strong(adjective, calm, good, person, set)
29
thick(adjective, characteristic, person, close, body)
28
hard(adjective, adverb, person, body, strong)
26
sturdy(adjective, calm, person, body, strong)
22
dense(adjective, characteristic, person, set, body)
20
concrete(adjective, set, hard, tough, correct)
17
steady(adjective, calm, good, strong, sound)
15
tough(adjective, calm, person, body, strong)
15
stiff(adjective, set, strong, hard, secure)
14
compact(adjective, close, set, hard, tough)
14
steadfast(adjective, calm, good, strong, secure)
12
fixed(adjective, set, strong, hard, sound)
11
heavy(adjective, characteristic, person, set, body)
11
close(adjective, set, hard, tough, correct)
11
durable(adjective, calm, strong, sound, tough)
11
impenetrable(adjective, close, set, hard, tough)
11
tight(adjective, adverb, good, close, strong)
10
compressed(adjective, set, hard, tough, firm)
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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>