let·down 
/ˈlɛtˌdaʊn/ noun
plural let·downs /ˈlɛtˌdaʊn/ noun [count] : something that is not as good as it was expected to be
▪ The news was a letdown. [=disappointment] — see also let down at 1let
▪ The news was a letdown. [=disappointment] — see also let down at 1let
