Answer: disillusionment

AnswerCrossword Clue
DISILLUSIONMENTIdealism opposite
DISILLUSIONMENTLearning that there's no Santa Claus
DISILLUSIONMENTResult of shattered ideals
DISILLUSIONMENTUnenchanted state
disillusionmentthe state of being disillusioned
disillusionmentA feeling of disappointment resulting from the discovery that something is not as good as one believed it to be