Definitions
1.verbTo sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for."His lack of respect disappointed her."
2.verbTo deprive (someone of something expected or hoped for).
3.verbTo fail to meet (an expectation); to fail to fulfil (a hope).
4.verbTo show (an opinion, belief, etc.) to be mistaken.
5.verbTo prevent (something planned or attempted).
6.adjectiveCausing disappointment."disappointing results / news; a disappointing experience"