Disappointed meaning : To sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for. 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. To prevent (something planned or attempted). Defeated of expectations or hope; experiencing disappointment; let down. Expressing or indicating disappointment.