disappointment          
noun uk/ˌdɪs.əˈpɔɪnt.mənt/ us/ˌdɪs.əˈpɔɪnt.mənt/
B1 [ U ]失望,沮丧 
the feeling of being disappointed
  Get tickets early to avoid disappointment. 早点预订以免扑空。 
 To my (great) disappointment (= sadness), he decided to leave. 令我(非常)沮丧的是,他决定离开。 
 B1 [ C usually singular ]令人失望的人(或事物) 
something or someone that is not what you were hoping it would be
  The party turned out to be a huge disappointment. 聚会办得令人大失所望。 
 I always felt I was a disappointment to my parents. 我总是觉得自己是一个让父母失望的孩子。 
 - More examples
 - Their son has been a deep disappointment to them.
 - She tried to hide her disappointment at not getting the promotion.
 - The match ended in disappointment for the retiring captain, Viv Richards.
 - She swallowed her disappointment, saying, "That's OK, it doesn't matter."
 - Failing the final exams was a bitter disappointment for me.