letdown
1. [ noun ] a feeling of dissatisfaction that results when your expectations are not realized
Synonyms: disappointment
Examples:

"his hopes were so high he was doomed to disappointment"

Related terms: dissatisfaction frustration disappoint
Similar spelling:   let_down
  Leaton
  lead_on
  Leyden
  Leiden
  leaden
  Ledonne
  lead-in
  Ledum