Definition of prohibitive adjective from the Oxford Advanced American Dictionary

      

    prohibitive

     adjective
    adjective
    NAmE//prəˈhɪbət̮ɪv//
     
    , NAmE//proʊˈhɪbət̮ɪv//
     
     
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  1. 1(of a price or a cost) so high that it prevents people from buying something or doing something synonym exorbitant prohibitive costs a prohibitive tax on imported cars The price of property in the city is prohibitive.
  2. 2preventing people from doing something by law prohibitive legislation
  3. 3 (of a person taking part in an election or a competition) extremely likely to win Miami began the day a prohibitive Super Bowl favorite.
prohibitively
 
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adverb Car insurance can be prohibitively expensive for young drivers.
See the Oxford Advanced Learner's Dictionary entry: prohibitive