Synonyms of opinionative

1 Syllable
hard, firm
2 Syllables
willful, headstrong, mulish, heady, steadfast, dogged
3 Syllables
unyielding, convinced, hardened, resolved, persistent, unflinching, contrary, adamant, pigheaded, tenacious, dogmatic, relentless, restive, self-willed, strong-minded, perverse
4 Syllables
intractable, immovable, intransigent, obdurate, cantankerous, obstinate, inflexible, pertinacious, refractory, contumacious, recalcitrant
5 Syllables
unalterable, unmanageable, indomitable, opinionated, contradictory