/ ˌdɪsəˈpɔɪnt; NAmE / verb
1.
to make sb feel sad because sth that they hope for or expect to happen does not happen or is not as good as they hoped :
[ vn ]
Her decision to cancel the concert is bound to disappoint her fans.
I hate to disappoint you, but I'm just not interested.
The movie had disappointed her (= it wasn't as good as she had expected) .
[ v ]
His latest novel does not disappoint.
[also vn that ]
2.
[ vn ] to prevent sth that sb hopes for from becoming a reality :
The new government had soon disappointed the hopes of many of its supporters.
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WORD ORIGIN
late Middle English (in the sense deprive of a position ): from Old French desappointer .