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

 

stupefyingly

 adverb
adverb
BrE BrE//ˈstjuːpɪfaɪɪŋli//
 
; NAmE NAmE//ˈstuːpɪfaɪɪŋli//
 
 
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in a way that makes you feel unable to think clearly because it is so bad, boring, etc. The party was stupefyingly dull.