(a.) Not tractable; not easily governed, managed, or directed; indisposed to be taught, disciplined, or tamed\; violent; stubborn; obstinate; refractory; as, an intractable child.

adamant adamantine beyond control breachy bullheaded contumacious defiant fractious headstrong immovable immutable incorrigible indocile indomitable inductile inelastic inextensible inextensile inextensional inflexible insubordinate insuppressible intractile intransigent irrepressible irresilient mulish noncooperating noncooperative nonelastic nonstretchable obstreperous out of hand pertinacious perverse recalcitrant refractory resistant resisting restive self-willed shrewish stubborn tough unalterable unbending unbiddable uncompliant uncontrollable uncooperative undisciplined unextendible unextensible unflexible ungiving ungovernable unlimber unmalleable unmanageable unmoldable unpliable unpliant unruly unsubmissive untractable unyielding wild willful