100 entries under tough topic. ×

4
spirited(adjective, strong, energetic, active)
4
uncompliant(adjective, firm, resolute, stubborn)
4
unmanageable(adjective, firm, persistent, obstinate)
4
willful(adjective, strong, firm, deliberate)
3
doughty(strong, firm, courage, resolute)
3
fervent(adjective, clear, complete, severe)
3
forceful(adjective, clear, strong, severe)
3
gutsy(adjective, clear, severe, energetic)
3
hardy(strong, solid, courage, resolute)
3
keen(adjective, clear, severe, intense)
3
perverse(adjective, firm, deliberate, fixed)
3
remorseless(adjective, harsh, cruel, fierce)
3
valiant(adjective, firm, resolute, brave)
2
balky(firm, inflexible, obstinate, stubborn)
2
cantankerous(firm, persistent, obstinate, stubborn)
2
cussed(firm, persistent, obstinate, stubborn)
2
fast(adjective, strong, firm, sensible)
2
game(adjective, energetic, resolute, spirited)
2
insubordinate(firm, persistent, obstinate, stubborn)
2
opinionated(adjective, firm, unreasonable, fixed)
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APASmart Define. (2016). determined thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/determined/thesaurus/synonyms
ChicagoSmart Define. 2016. "determined thesaurus" https://smartdefine.org/determined/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, determined thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/determined/thesaurus/synonyms>.
MLASmart Define. "determined thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/determined/thesaurus/synonyms>