intractable

intractable adjective adamant, balky, beyond connrol, contrary, contumacious, defiant, difficilis, disobedient, dogged, firm, froward, headstrong, heedless, incorrigible, indocile, indocilis, indomitable, inflexible, insubordinate, irrepressible, mulish, not easily governed, not pliable, obdurate, obstinate, obstreperous, pertinacious, perverse, pervicacious, rebellious, recalcitrant, refractory, resistive, restive, stubborn, tenacious, unbending, uncurbed, undisciplined, ungovernable, unmalleable, unmanageable, unruly, unsubmissive, unwilling, wayward, willful

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See also: contumacious, difficult, disobedient, froward, immutable, incorrigible, indomitable, inexorable, inflexible, insubordinate, lawless, nonconsenting, obdurate, pertinacious, perverse, recalcitrant, renitent, restive, rigid, severe, unbending, uncontrollable, unruly, unyielding, willful