adjective

failing to fulfil someone’s hopes or expectations.

the team made a disappointing start

saddening,disheartening,dispiriting,discouraging,upsetting,dismaying,depressing,distressing,disenchanting,disillusioning,dissatisfying,regrettable,unfortunate,unsatisfactory,inadequate,insufficient,unworthy,substandard,not good enough,poor,inferior,deficient,second-rate,pathetic,lame,pitiful,anticlimactic,below par,not up to scratch,not up to snuff,sorry,not all it’s cracked up to be,underwhelming,duff,ropy,rubbish