disappointment

noun

an act (or failure to act) that disappoints someone
誰かを失望させる行為（または不作為）
a feeling of dissatisfaction that results when your expectations are not realized
期待が実現されないときに生じる不満感
- his hopes were so high he was doomed to disappointment
  彼の望みはあまりに高すぎて、期待外れに終わった

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