Definition of disappoint verb from the Oxford Advanced American Dictionary

      

    disappoint

     verb
    verb
    NAmE//ˌdɪsəˈpɔɪnt//
     
    Verb Forms present simple I / you / we / they disappoint
     
    he / she / it disappoints
     
    past simple disappointed
     
    -ing form disappointing
     
     
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  1. 1[transitive, intransitive] disappoint (somebody) (it disappoints somebody that…) to make someone feel sad because something that they hope for or expect to happen does not happen or is not as good as they hoped 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). His latest novel does not disappoint.
  2. 2[transitive] disappoint something to prevent something that someone hopes for from becoming a reality The new government had soon disappointed the hopes of many of its supporters.
See the Oxford Advanced Learner's Dictionary entry: disappoint