The Collaborative International Dictionary of English v.0.48:

Unconvinced \Unconvinced\
   See convinced.

WordNet (r) 3.0 (2006):

unconvinced
    adj 1: lacking conviction; "I remain unconvinced" [ant:
           convinced]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "unconvinced":
   agnostic, ambiguous, capricious, chancy, changeable, creedless,
   dicey, disbelieving, doubting, equivocal, erratic, faithless,
   fickle, heretical, hesitant, hesitating, incalculable, incredulous,
   indecisive, indemonstrable, irreligious, irresolute, minimifidian,
   nonbelieving, nullifidian, polysemous, repudiative, skeptical,
   touch-and-go, unaccountable, unbelieving, uncertain, unconfident,
   unconfirmable, unconverted, undivinable, unforeseeable,
   unpersuaded, unpredictable, unprovable, unsure, unverifiable,
   variable, wavering, whimsical, without faith