a.

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

   你不能前来，我们很失望。

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

   她沮丧地得知那门课没有考及格。

   We were disappointed at the results.

   我们对结果感到失望。

2. （希望等）落空的；受挫折的

adj.