stubborn
bull-headed, contumacious, cross-grained, dogged, dour, fixed, headstrong, inflexible, intractable, mulish, obdurate, obstinate, opinionated, persistent, pig-headed, recalcitrant, refractory, self-willed, stiff-necked, tenacious, unbending, unmanageable, unshakable, unyielding, wilful
Antonyms
biddable, compliant, docile, flexible, half-hearted, irresolute, malleable, manageable, pliable, pliant, tractable, vacillating, wavering, yielding