WordNet (r) 3.0 (2006):

uncooperative
    adj 1: unwilling to cooperate; "an uncooperative witness" [ant:
           cooperative]
    2: intentionally unaccommodating; "the action was not offensive
       to him but proved somewhat disobliging" [syn: disobliging,
       uncooperative]

Moby Thesaurus II by Grady Ward, 1.0:

122 Moby Thesaurus words for "uncooperative":
   adversary, adversative, adverse, alien, antagonistic, anti,
   antipathetic, antithetic, balking, balky, bigoted, bulldogged,
   bulletheaded, bullheaded, case-hardened, clashing, competitive,
   complaining, con, conflicting, contradictory, contrary, counter,
   cross, deaf to, declinatory, disaccordant, disobedient,
   disputatious, disputing, disregardful, dissentient, dissenting,
   dogged, dogmatic, enemy, fanatic, forgetful, fractious, hardheaded,
   headstrong, heedless, hostile, inconsiderate, indocile, inimical,
   insubordinate, intolerant, intractable, mindless, mulish, negative,
   nonconsenting, noncooperating, noncooperative, objecting,
   obstinate, obstructive, on the barricades, opinionated, opponent,
   opposed, opposing, opposite, oppositional, oppositive, oppugnant,
   overthwart, overzealous, persevering, pertinacious, perverse,
   pigheaded, proof against, protesting, rebellious, recalcitrant,
   refractory, rejective, reluctant, renitent, repellent, repugnant,
   resistant, resisting, resistive, respectless, restive, retardant,
   retardative, rival, self-willed, set, stiff-necked, strong-willed,
   strongheaded, stubborn, sulky, sullen, tenacious, thoughtless,
   unaccommodating, uncomplaisant, uncompliant, uncomplying,
   unconsenting, unfavorable, unfriendly, unheedful, unhelpful,
   unmindful, unobliging, unpropitious, unregenerate, unsubmissive,
   unthinking, unthoughtful, unwilling, unyielding, up in arms,
   willful, withstanding