561 entries under adjective topic. ×

7
unadaptable(set, hard, stiff, rigid)
7
undeviating(strong, smooth, flat, harsh)
7
wilful(determined, resolute, uncompromising, unshakeable)
6
chilly(person, severe, feelings, response)
6
constant(strong, secure, moderate, flat)
6
contumacious(tough, firm, determined, unreasonable)
6
indurate(mean, hard, firm, determined)
6
ironclad(set, hard, severe, harsh)
6
persevering(strong, tough, flat, firm)
6
steady(strong, secure, moderate, flat)
6
sturdy(close, strong, hard, tough)
6
unflinching(strong, flat, firm, harsh)
6
unmoved(determined, fixed, stubborn)
6
willful(tough, firm, determined, resolute)
5
authoritarian(strong, hard, tough, severe)
5
bovine(determined, resolute, obstinate, uncompromising)
5
brass-bound(determined, resolute, obstinate, uncompromising)
5
demanding(hard, severe, rough, difficult)
5
exacting(severe, severity)
5
hard-hearted(mean, hard, harsh, stubborn)
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APASmart Define. (2016). inflexible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>