150 entries under inflexible topic. ×

4
headstrong(adjective, tough, firm, determined, unreasonable)
4
in the bag(expression, adjective, idiom, firm, solid)
4
inelastic(adjective, severe, firm, solid, determined)
4
quiescent(calm, still, steady, impassive)
4
single-minded(adjective, tough, firm, solid, determined)
4
stony(adjective, hard, firm, solid, stiff)
4
unblinking(adjective, prearranged, intent, cliquish)
4
unmodifiable(adjective, set, secure, certain, steady)
3
congealed(verb, adjective, set, hard, firm)
3
incorrigible(adjective, even, rigid, established)
3
jelled(adjective, set, firm, solid, heavy)
3
narrow(adjective, fine, thin, positive)
3
ossified(adjective, set, firm, solid, heavy)
3
pigheaded(adjective, mean, hard, tough, firm)
3
refractory(adjective, hard, tough, rough, firm)
3
rigorous(adjective, hard, severe, stiff, rigid)
3
steely(adjective, hard, firm, solid, rigid)
3
thick(adjective, strong, hard, firm, solid)
3
unadaptable(adjective, set, hard, stiff, rigid)
2
contracted(verb, adjective, hard, slight, fine)
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APASmart Define. (2016). fixed thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/fixed/thesaurus/synonyms
ChicagoSmart Define. 2016. "fixed thesaurus" https://smartdefine.org/fixed/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, fixed thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/fixed/thesaurus/synonyms>.
MLASmart Define. "fixed thesaurus" 16 March 2016. Web. 27 September 2026. <https://smartdefine.org/fixed/thesaurus/synonyms>