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



    BrE BrE//prɪˈpɒstərəsli//
    ; NAmE NAmE//prɪˈpɑːstərəsli//
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  1. 1in a way that is completely unreasonable, especially when it is shocking or annoying synonym outrageously a preposterously expensive bottle of wine
  2. 2in a way that is greater than what seems reasonable or appropriate She was relatively poor and he was preposterously rich.