/ˌdɪsəˈpɔɪnt ||; ˌdɪsəˈpɔɪnt/verb
[T] to make sb sad because what he/she had hoped for has not happened or is less good, interesting, etc then he/she had hoped 使失望:
I'm sorry to disappoint you but I'm afraid you haven't won the prize.我很抱歉让你失望,但你恐怕没有得奖。