/ ˌdɪsəˈpɔɪntmənt; NAmE / noun
1.
[ U ] sadness because sth has not happened or been as good, successful, etc. as you expected or hoped :
Book early for the show to avoid disappointment.
To our great disappointment , it rained every day of the trip.
He found it difficult to hide his disappointment when she didn't arrive.
2.
[ C ] disappointment (to sb) a person or thing that is disappointing :
a bitter / major disappointment
That new restaurant was a big disappointment.
I always felt I was a disappointment to my father.