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

 

horrendously

 adverb
adverb
BrE BrE//hɒˈrendəsli//
 
; NAmE NAmE//hɔːˈrendəsli//
 
, NAmE//hɑːˈrendəsli//
 
(usually informal)
 
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in a way that is shocking or unacceptable horrendously expensive