a.

1. 失望的，沮喪的[（+at/about/in/with）][+to-v][+that]
   We are disappointed that you will not be able to come.

   你不能前來，我們很失望。

   She was disappointed to learn that she had failed the course.

   她沮喪地得知那門課沒有考及格。

   We were disappointed at the results.

   我們對結果感到失望。

2. （希望等）落空的；受挫折的

1. disappoint的動詞過去式、過去分詞

adj.