disappointingly
adverb
UK/ˌdɪs.əˈpɔɪn.tɪŋ.li/
US/ˌdɪs.əˈpɔɪn.t̬ɪŋ.li/
Definitions of disappointingly adverb
in a manner that causes disappointment or dissatisfaction
The restaurant's service was disappointingly slow.
He disappointingly declined our proposal.
The ending of the movie was disappointingly abrupt.