disappointed at

disappointed at (someone or something)

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 somethingbecoming 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