Definition of mind-numbingly adverb from the Oxford Advanced Learner's Dictionary

 

mind-numbingly

 adverb
adverb
BrE BrE//ˈmaɪnd nʌmɪŋɡli//
 
; NAmE NAmE//ˈmaɪnd nʌmɪŋɡli//
 
 
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in a way that is extremely boring The lecture was mind-numbingly tedious.