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

 

prohibitively

 adverb
adverb
BrE BrE//prəˈhɪbətɪvli//
 
; NAmE NAmE//proʊˈhɪbətɪvli//
 
 
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at such a high price that people are prevented from buying something or doing something synonym exorbitantly Car insurance can be prohibitively expensive for young drivers.