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

 

gruesomely

 adverb
adverb
BrE BrE//ˈɡruːsəmli//
 
; NAmE NAmE//ˈɡruːsəmli//
 
 
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in a way that is very unpleasant and fills you with horror, usually because it is connected with death or injury