intractable/intransigent

awkward bullheaded cantankerous contrary hang-tough hard-line headstrong immovable incompliant incurable indocile indomitable insoluble locked-in mulish obdurate obstinate pat pertinacious perverse pigheaded recalcitrant refractory resolute self-willed set in stone tenacious tough unbending uncompromising uncooperative undisciplined ungovernable unmanageable unpliable unruly unyielding wayward wild willful

amenable easy facile manageable