Definition of underwhelming adjective from the Oxford Advanced Learner's Dictionary

 

underwhelming

 adjective
adjective
BrE BrE//ˌʌndəˈwelmɪŋ//
 
; NAmE NAmE//ˌʌndərˈwelmɪŋ//
 
(informal, humorous)
 
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not impressing or exciting you at all the contrast between his overwhelming guitar-playing and his underwhelming singing
See the Oxford Advanced American Dictionary entry: underwhelming