kuvvet veya enerjinin azalması

listen to the pronunciation of kuvvet veya enerjinin azalması
Türkisch - Englisch
letdown
Disappointment, the sad state of not living up to expectations

It's such a letdown, I thought it was going to be better than this.

an event, performance etc that is not as good as you expected it to be = disappointment
{i} disappointment, discouragement, feeling of depression; decrease, reduction
a feeling of dissatisfaction that results when your expectations are not realized; "his hopes were so high he was doomed to disappointment"