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

 

grievously

 adverb
adverb
BrE BrE//ˈɡriːvəsli//
 
; NAmE NAmE//ˈɡriːvəsli//
 
(formal)
 
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in a very serious way and often causing great pain or suffering grievously hurt/wounded