153 entries under firm topic. ×

3
rebellious(adjective, tough, unreasonable, obstinate)
3
settled(adjective, strong, flat, certain)
3
starched(adjective, hard, solid, stiff)
3
stark(adjective, hard, severe, solid)
3
strong(adjective, set, hard, tough, flat)
3
strong-minded(adjective, determined, resolution, fixed)
3
sure(adjective, strong, tough, flat)
3
tense(adjective, hard, solid, stiff)
3
unfaltering(adjective, strong, certain, limited)
3
ungiving
2
bound(adjective, strong, tough, flat)
2
brittle(adjective, hard, solid, stiff)
2
compact(adjective, close, set, strong, hard)
2
concentrated(adjective, set, strong, hard, tough)
2
dead set on(expression, adjective, idiom, strong, secure)
2
enduring(adjective, strong, flat, certain)
2
fast(adjective, close, strong, secure, tough)
2
indurated(adjective, set, strong, hard)
2
insubordinate(adjective, tough, unreasonable, obstinate)
2
loyal(adjective, strong, determined, bold)
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APASmart Define. (2016). inflexible thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/inflexible/thesaurus/synonyms
ChicagoSmart Define. 2016. "inflexible thesaurus" https://smartdefine.org/inflexible/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, inflexible thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/inflexible/thesaurus/synonyms>.
MLASmart Define. "inflexible thesaurus" 24 March 2016. Web. 30 September 2026. <https://smartdefine.org/inflexible/thesaurus/synonyms>