bum·mer 
/ˈbʌmɚ/ noun
/ˈbʌmɚ/ noun [singular] informal : something that is unpleasant or disappointing
▪ That was a real bummer of a movie. ▪ You can't go? What a bummer!
▪ That was a real bummer of a movie. ▪ You can't go? What a bummer!
