disappointment

despair, desperation, depression, disappointment

这些名词都有“绝望、沮丧”之意。
despair: 普通用词，指因灾难等因素而丧失希望和信心，陷入沮丧，绝望的境地。
desperation: 语气强烈，指因绝望而使人采取无所顾忌的疯狂行动。
depression: 侧重指因遭受重大失利或挫折而产生的低落情绪。
disappointment: 多指愿望或期望的落空。

名词 disappointment:

1. a feeling of dissatisfaction that results when your expectations are not realized
   同义词：letdown
2. an act (or failure to act) that disappoints someone
   同义词：dashing hopes

1. To my disappointment, my father doesn't agree to buy me a new bike.
   我父亲不同意给我买新脚踏车，我很失望。
2. After months of disappointment, his perseverance was finally rewarded.
   数月来他经历挫折而不断努力，终於有了收获。
3. She gestured her disappointment by laying her hand on her forehead.
   她把手放在额头上，以表示失望。
4. That defeat was a surprise and a disappointment.
   那次失败令人吃惊，令人失望。
5. He expressed keen disappointment that the hearing had been postponed.
   他对听证会延期表示大为沮丧。