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

 

terrifyingly

 adverb
adverb
BrE BrE//ˈterɪfaɪɪŋli//
 
; NAmE NAmE//ˈterɪfaɪɪŋli//
 
 
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in a way that makes somebody feel extremely frightened The mountain roads are terrifyingly steep.