disenchantment

/ˌdɪsɪnˈtʃæntmənt/
noun
  1. A feeling of disappointment or dissatisfaction resulting from discovering that something is not as good as one believed it to be.
    • There is a growing sense of disenchantment among employees who feel their hard work is not appreciated.
    • His disenchantment with politics began when he saw how little change actually happened after elections.
    • The novel captures the disenchantment of a generation that grew up with high hopes and faced harsh realities.
Antonyms
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