Noun
a feeling of dissatisfaction that results when your expectations are not realized
Source: WordNetThe best teaching I ever experienced was at Exeter. Yale was a distinct letdown afterward. John Knowles
Well, I guess I'll see you around. You're the first Shadowhunter I've ever met." "That's too bad,"said Jace, "since all the ones you meet from now on will be a terrible letdown. Cassandra Clare
The destiny of photography has taken it far beyond the role to which it was originally thought to be limited: to give more accurate reports on reality (including works of art). Photography is the reality; the real object is often experienced as a letdown. Susan Sontag
Julian: "Wikipedia knows about everything. It might be run by warlocks.” Emma: "You think that's what they do all day in the Spiral Labyrinth? Run Wikipedia?” Julian: "I admit it seems like a letdown. Cassandra Clare
A letdown is worth a few songs. A heartbreak is worth a few albums. Taylor Swift
The research period of a film is the most exciting part of the process, and filming is sometimes a letdown because when you're dealing with biopic material, the real thing is always much more intricate than the story told in the film. Alessandro Nivola