unhappy because someone or something was not as good as you hoped or expected, or because something did not happen

We were deeply disappointed at/about the result. 我们对这个结果深感失望。

His parents were bitterly disappointed in/with him. 父母对他非常失望。

[ + (that) ] She was disappointed (that) they hadn't phoned. 他们没来电话让她感到很失望。

[ + to infinitive ] He was disappointed to find they'd already left. 他失望地发现他们已经走了。

If you're expecting Dad to let you borrow his car, you're going to be sorely disappointed. 如果你指望爸爸能把汽车借给你，那你会失望透顶的。

Synonyms: crestfallendeflateddevastated (VERY UPSET)dismayedgutted