Something that is disappointing is not as good or as large as you hoped it would be. The wine was excellent, but the meat was overdone and the vegetables disappointing. Progress is disappointingly slow.

What do you call something disappointing?

bummer. noun. informal something that is annoying or disappointing.

What is a stronger word for disappointing?

Synonyms & Near Synonyms for disappointed. disenchanted, disillusioned, frustrated, unfulfilled.