dis|ap|point [ˌdısəˈpɔınt] v [I and T]
[Date: 1400-1500; : Old French; Origin: desapointier, from apointier 'to arrange']
1.) to make someone feel unhappy because something they hoped for did not happen or was not as good as they expected
I hated to disappoint her.
Great things were expected of this band, and they didn't disappoint.
2.) disappoint sb's hopes/expectations/plans
to prevent something from happening that someone hoped for or expected
The Berlin settlement of 1878 disappointed Russian hopes in the Balkans.

Dictionary of contemporary English. 2013.