upset because something you hoped for has not happened or been as good, successful, etc. as you expected disappointed (at/by something) They were bitterly disappointed at the result of the game. I was disappointed by the quality of the wine. disappointed (in/with somebody/something) I'm disappointed in you—I really thought I could trust you! I was very disappointed with myself. disappointed (to see, hear, etc.) He was disappointed to see she wasn't at the party. disappointed (that…) I’m disappointed (that) it was sold out. disappointed (not) to be… She was disappointed not to be chosen.