Definition of preposterous adjective from the Oxford Advanced American Dictionary

     

    preposterous

     adjective
    adjective
    NAmE//prɪˈpɑstərəs//
     
    (formal)
     
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  1. 1completely unreasonable, especially in a way that is shocking or annoying synonym outrageous These claims are absolutely preposterous! It's preposterous to suggest that everything was her fault!
  2. 2 unusual in a silly or shocking way synonym outrageous The band members were famous for their preposterous clothes and haircuts.
preposterously
 
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adverb a preposterously expensive bottle of wine
See the Oxford Advanced Learner's Dictionary entry: preposterous