disappointment disappointment /ˌdɪsəˈpɔɪntmənt/

noun

1. () A feeling of dissatisfaction that results when your expectations are not realized  ( letdown , disappointment )
   a feeling of dissatisfaction that results when your expectations are not realized
    His hopes were so high he was doomed to disappointment
   his hopes were so high he was doomed to disappointment
   
2. () An act (or failure to act) that disappoints someone  ( dashing hopes , disappointment )
   an act (or failure to act) that disappoints someone
    His failure to show up was a great disappointment to her.
   His failure to show up was a great disappointment to her.