124 entries under rigid topic. ×

4
stony(adjective, hard, firm, solid, stiff)
4
strict(adjective, strong, hard, severe, stiff)
4
unfailing(adjective, set, clear, certain, regular)
4
unmodifiable(adjective, set, secure, certain, steady)
3
concrete(adjective, set, strong, hard, solid)
3
congealed(verb, adjective, set, hard, firm)
3
dyed-in-the-wool(adjective, set, hard, strict)
3
incorrigible(adjective, even, inflexible, established)
3
jelled(adjective, set, firm, solid, heavy)
3
ossified(adjective, set, firm, solid, heavy)
3
refractory(adjective, hard, tough, rough, firm)
3
rigorous(adjective, hard, severe, stiff)
3
severe
3
steely(adjective, hard, firm, solid)
3
thick(adjective, strong, hard, firm, solid)
3
unadaptable(adjective, set, hard, stiff)
2
contracted(verb, adjective, hard, slight, fine)
2
hardened(adjective, set, hard, complete, firm)
2
harsh(adjective, mean, hard, severe, rough)
2
incompliant(adjective, hard, firm, solid, stiff)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 23 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>