disappointing
verb
Definitions
To sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for.
Example: His lack of respect disappointed her.
To deprive (someone of something expected or hoped for).
To fail to meet (an expectation); to fail to fulfil (a hope).
To show (an opinion, belief, etc.) to be mistaken.
adjective
Definitions
Causing disappointment.
Example: disappointing results / news; a disappointing experience