The Collaborative International Dictionary of English v.0.48:

Unwilling \Un*will"ing\, a.
   Not willing; loath; disinclined; reluctant; as, an unwilling
   servant.
   [1913 Webster]

         And drop at last, but in unwilling ears,
         This saving counsel, "Keep your piece nine years."
                                                  --Pope.
   [1913 Webster] -- Un*will"ing*ly, adv. --
   Un*will"ing*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unwilling
    adj 1: not disposed or inclined toward; "an unwilling
           assistant"; "unwilling to face facts" [ant: willing]
    2: in spite of contrary volition

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "unwilling":
   afraid, at odds, automatic, averse, backward, blind, compulsive,
   conditioned, cursory, deaf to, declinatory, differing, disagreeing,
   disinclined, disobedient, forced, fractious, hesitant, impulsive,
   indisposed, indocile, instinctive, involuntary, loath, mechanical,
   mutinous, negative, nonconsenting, opposed, perfunctory,
   recalcitrant, reflex, reflexive, refractory, rejective, reluctant,
   resistant, sulky, sullen, uncomplaisant, uncompliant, uncomplying,
   unconscious, unconsenting, uncooperative, uneager, unintentional,
   unthinking, unwilled, unwitting