disappointed at

(redirected from disappointed in becoming sad because of)

disappointed at (someone or something)

To become disheartened or upset by someone or something. I know that my parents are very disappointed at my report card this semester.
See also: disappointed

disappointed at someone or something

 and disappointed in someone or something
becoming sad because of someone or something. I am really disappointed at what you did. I am very disappointed in you. That was a terrible thing to do. They were disappointed in the outcome.
See also: disappointed