Stubborn

determined firm hardheaded unyielding fixed inflexible mulish opinionated persistent pigheaded rebellious rigid steadfast tenacious willful adamant dogged headstrong intractable obdurate persevering recalcitrant relentless self-willed tough unbending unmanageable unreasonable untoward balky bullheaded cussed inexorable insubordinate ornery pertinacious perverse set in one’s ways single-minded stiff-necked cantankerous contumacious refractory unshakable