adjective

sad or displeased because someone or something has failed to fulfil one’s hopes or expectations.

I’m disappointed in you, Mary

saddened,upset,let down,disheartened,downhearted,cast down,downcast,depressed,dispirited,discouraged,despondent,dismayed,crestfallen,distressed,chagrined,disenchanted,disillusioned,displeased,discontented,dissatisfied,frustrated,disgruntled,choked,miffed,cut up,gutted,as sick as a parrot