Definition of presumptuous adjective from the Oxford Advanced American Dictionary

  

presumptuous

 adjective
adjective
NAmE//prɪˈzʌmptʃuəs//
 
[not usually before noun]
 
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too confident, in a way that shows a lack of respect for other people Would it be presumptuous of me to ask to borrow your car?
See the Oxford Advanced Learner's Dictionary entry: presumptuous