Disappointed is the flat, sinking feeling when the thing you hoped for does not happen. The concert is cancelled, the letter says no, the friend you waited an hour for never comes.
The prepositions are the hard part. You are disappointed WITH or IN a person, disappointed BY a result, disappointed AT the news, disappointed THAT the shop had closed, disappointed TO hear it. Keep the two endings straight: the film is disappointing, and you are disappointed — a disappointing person lets others down, a disappointed person has been let down. The noun disappointment names both the feeling and the thing itself: after all that build-up, the ending was a disappointment. And I'm not angry, just disappointed is a parent's line that lands harder than shouting.
1adjectivedisappointedUnhappy because something you hoped for did not happen or was not as good as you expected.~91%
“She was disappointed that nobody had saved her a seat.”
2adjectivefailedUnhappy with someone because they have failed to meet your expectations.~9%
“His coach looked disappointed in him for the first time.”
Shares are an estimate: a language model read 15 sentences found in the wild and placed 11 of them on a sense (4 were unclear) — a count of our sample, not a measurement of English.