对某人失望的英语怎么说

To be disappointed in someone means to feel let down or dissatisfied with their behavior or actions. This phrase comes from the verb "to disappoint," which means to fail to fulfill someone's expectations or hopes. Here are some examples of this phrase in action:

I was really disappointed in you when you didn't show up for our meeting.
My parents were disappointed in me when I didn't get good grades in school.
Many people were disappointed in the candidate when they broke their campaign promises.

In Chinese, this phrase could be translated as "对某人失望" or "对某人感到失望."