adamant dogmatic headstrong inflexible intransigent recalcitrant steadfast tenacious unyielding willful convinced dogged firm hardened resolved cantankerous contradictory contrary contumacious dead set on hard heady immovable indomitable intractable locked in mulish obdurate opinionated opinionative persistent pertinacious perverse pigheaded refractory relentless restive self-willed strong-minded unalterable unflinching unmanageable