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

 

indescribably

 adverb
adverb
BrE BrE//ˌɪndɪˈskraɪbəbli//
 
; NAmE NAmE//ˌɪndɪˈskraɪbəbli//
 
 
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to such an extreme or usual degree that it is almost impossible to describe indescribably beautiful/boring