noun
a feeling of disappointment resulting from the discovery that something is not as good as one believed it to be
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The candidate's promises of reform eventually led to disillusion among the voters.
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I was completely disillusioned when I found out the truth about the company's practices.
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I was so hyped for the concert, but I left feeling totally disillusioned.
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The once idealistic artist became disillusioned with the commercialism of the art world.