Definition of disappointingly adverb from the Oxford Advanced Learner's Dictionary

 

disappointingly

 adverb
adverb
BrE BrE//ˌdɪsəˈpɔɪntɪŋli//
 
; NAmE NAmE//ˌdɪsəˈpɔɪntɪŋli//
 
 
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in a way that is not as good, successful, etc. as you had hoped The room was disappointingly small.