D0250500 (dĭs′ə-poin′tĭng)adj. Not up to expectations or hopes: a disappointing test score; finished the marathon in a disappointing 12th place.dis′ap·point′ing·ly adv.Thesaurus
Adv.
1.
disappointingly - in a disappointing manner; "the discoverer of argon, Sir William Ramsay, looked disappointingly ordinary"