disappointingly
adverb/ˌdɪsəˈpɔɪntɪŋli/
/ˌdɪsəˈpɔɪntɪŋli/
- in a way that is not as good, successful, etc. as you had hoped
- The room was disappointingly small.
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disappointingly
Definition of disappointingly adverb from the Oxford Advanced Learner's Dictionary