Définitions
1.VerbTo sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for."His lack of respect disappointed her.; I was disappointed by last year’s revenue."
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.Verb↑ Douglas Harper (2001–2026), “disappoint”, in Online Etymology Dictionary.