WordNet (r) 3.0 (2006):

disillusioned
    adj 1: freed from illusion

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "disillusioned":
   against, baffled, balked, betrayed, bilked, blase, blasted,
   blighted, chapfallen, con, crestfallen, crossed, crushed, dashed,
   defeated, disabused, disappointed, disapprobatory, disapproving,
   discontented, disenchanted, disgruntled, dished, displeased,
   dissatisfied, dissenting, enlightened, foiled, frustrated,
   ill done-by, ill-served, indignant, knowing, let down, low,
   mondaine, opposed, opposing, out of countenance, poor,
   put straight, regretful, robbed of illusion, set right,
   sophisticate, sophisticated, sorely disappointed, soured, thwarted,
   turned-off, unappreciative, unapproving, uncharmed,
   uncomplimentary, undeceived, unfavorable, unhappy, unspelled,
   world-wise, worldly, worldly-wise