noun
the feeling of sadness or displeasure caused by the nonfulfillment of one's hopes or expectations
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The team's performance in the final match was a huge disappointment to their fans.
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I was so excited for the movie but it turned out to be a total disappointment.
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I thought the party was going to be lit, but it was a major disappointment.
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His constant letdowns have become a disappointment cloud hanging over our friendship.