1) very sad and disappointed (crestfallen)
2) causing a person to be disappointed (disappointing)
3) the state of being disappointed (disappointment)
4) (used as a form of apology saying one is) feeling unhappy and disappointed with oneself for something one did or did not do (sorry)
(of a person, a record) defeated: a beaten man (e.g. one who has lost a legal or personal battle)
defeated
not pleased or satisfied with something; disillusioned
let down
annoyed; angry; in a bad mood
unhappy; critical
not feeling happy or pleased (with)
discontented, unhappy
(of a person) sad; depressed; (of eyes) looking downwards (especially with sadness, shame etc)
depressed, unhappy