making you feel disappointed► disappointing something that is disappointing makes you feel unhappy or dissatisfied, because it is not as good as you hoped it would be: · The team had a disappointing season.· Company profits this year have been very disappointing.
► be a disappointment something that is a disappointment does not happen in the way you hoped, or is not as good as you expected: · The holiday was a bit of a disappointment - it rained the whole time.be a disappointment to: · The election results were a disappointment to civil rights groups.be a great/major disappointment: · It was a great disappointment to my parents that I didn't go to university.
► not live up to (somebody's) expectations if an event or person does not live up to expectations , you expected them to be very good but in fact they are not: · I'm afraid as a husband I never really lived up to Kelly's expectations.· Despite the enormous cost of making it, the film didn't live up to expectations.fail to live up to (somebody's) expectations: · I failed to live up to my parents' expectations, particularly at school.
► be a letdown spoken if something is a letdown , you do not enjoy it as much as you expected: · The party was a real letdown.· After months of planning and anticipation, the Florida trip was kind of a letdown.
► be an anticlimax/be anticlimactic something that is an anticlimax or is anticlimactic does not seem very exciting or interesting because it comes after something that was much better: · Going back to work after a month travelling in China is bound to be an anticlimax.· Compared to the excitement of the earlier parts of the film, the ending was a little anticlimactic.
► be a non-event an event or occasion that is a non-event is disappointing because nothing interesting or exciting happened: · Sue's party was a total non-event. Only five people turned up.
► be a bummer spoken informal if you say that a situation or event is a bummer , you mean it is very disappointing: · "I heard Reggie's going to quit the team." "That's a bummer."bummer! American: · "The party was last Saturday." "Oh, bummer! I always miss those things."
► something is not all it's cracked up to be informal use this to say that something is not as good as people say it is: · Northbourne Leisure Centre isn't all it's cracked up to be, they don't even have a sauna.· Being a fashion model isn't all it's cracked up to be. It is extremely hard work.
a situation or event that does not seem exciting because it happens after something that was much better: 
Going back to work after a month travelling in China was bound to be an anticlimax.