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

 

unutterably

 adverb
adverb
BrE BrE//ʌnˈʌtərəbli//
 
; NAmE NAmE//ʌnˈʌtərəbli//
 
(formal)
 
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extremely; used to emphasize how great a particular emotion or quality is Life on a hospital ward can be unutterably dull.