Definition of presumptuous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//prɪˈzʌmptʃuəs//
; NAmE NAmE//prɪˈzʌmptʃuəs//
[not usually before noun] Confident
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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? Isn’t it rather presumptuous of you to decide what he needs? It would be presumptuous to assume she will accept the offer. See related entries: Confident Word OriginMiddle English: from Old French presumptueux, from late Latin praesumptuosus, variant of praesumptiosus ‘full of boldness’, from praesumptio ‘anticipation’, from the verb praesumere ‘anticipate’ (in late Latin ‘take for granted’), from prae ‘before’ + sumere ‘take’.
See the Oxford Advanced American Dictionary entry: presumptuous