noun (n)

• a feeling of dissatisfaction that results when your expectations are not realized

  rasa ketidakpuasan yang terhasil ketika harapanmu tidak menyadari

  Example:
  His hopes were so high he was doomed to disappointment.
  

  Synonym:
  letdown
  

  source: wordnet30
• an act (or failure to act) that disappoints someone

  tindakan (atau kegagalan untuk bertindak) itu disappoints seseorang

  Synonym:
  dashing hopes
  

  source: wordnet30
• The act of disappointing, or the state of being disappointed; defeat or failure of expectation or hope; miscarriage of design or plan; frustration.

  tindakan yang mengecewakan, atau keadaan dikecewakan; kekalahan atau kegagalan dari jangkaan atau harapan; keguguran desain atau rencana; frustrasi.

  source: webster1913