173 entries under determined topic. ×

10
die-hard(adjective, tough, moderate, resist)
10
hardened(adjective, person, hard, tough, firm)
10
hardheaded(adjective, strong, hard, tough, cold)
10
staunch(adjective, strong, tough, flat, firm)
10
stringent(adjective, hard, severe, rough, difficult)
9
opinionated(adjective, firm, unreasonable, fixed)
9
perverse(adjective, mean, hard, firm, deliberate)
9
standing pat(adjective, resolute, obstinate, uncompromising)
9
unforgiving(adjective, person, hard, rough, harsh)
8
brassbound(adjective, resist, resolute, persistent)
8
bull-headed(adjective, resolute, obstinate, stubborn)
8
merciless(adjective, person, hard, rough, harsh)
8
pig-headed(adjective, resolute, obstinate, stubborn)
8
single-minded(adjective, tough, firm, harsh, cruel)
8
strong-willed(adjective, resolution, resolute, uncompromising)
7
bigoted(adjective, resolute, rigid, obstinate)
7
cruel(adjective, strong, hard, tough, severe)
7
hanging tough(expression, adjective, mean, hard)
7
indomitable(adjective, set, strong, hard, tough)
7
pitiless(adjective, severe, harsh, cruel)
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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>