83 entries under determined topic. ×

1
perverse(tough, difficult, awkward, fixed)
1
pigheaded(tough, difficult, awkward, fixed)
1
redoubtable(tough, difficult, vigorous, noble)
1
rugged(adjective, strong, hard, tough)
1
self-willed(tough, difficult, wild, awkward)
1
spirited(adjective, strong, tough, bold)
1
unceasing(adjective, strong, firm, steady)
1
undeterred(adjective, strong, firm, steady)
1
unstinted(adjective, strong, firm, steady)
0
contradictory(fixed, stubborn, willful, dogmatic)
0
convinced(fixed, stubborn, willful, dogmatic)
0
dogmatic(fixed, stubborn, willful)
0
eager beaver(expression, adjective, strong, firm)
0
fixed(hard, resolute, rigid, inflexible)
0
grind(adjective, strong, firm, steady)
0
hardened(fixed, stubborn, willful, dogmatic)
0
heady(fixed, stubborn, willful, dogmatic)
0
incessant(adjective, strong, firm, steady)
0
opinionated(fixed, stubborn)
0
opinionative(fixed, stubborn, willful, dogmatic)
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APASmart Define. (2015). indomitable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/indomitable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indomitable thesaurus" https://smartdefine.org/indomitable/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, indomitable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/indomitable/thesaurus/synonyms>.
MLASmart Define. "indomitable thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/indomitable/thesaurus/synonyms>