pre ‧ sump ‧ tu ‧ ous /prɪˈzʌmptʃuəs/ BrE AmE adjective formal
doing something that you have no right to do and that seems rude
is it presumptuous (of somebody) to do something
Would it be presumptuous of me to ask why you are so miserable?
—presumptuously adverb
—presumptuousness noun [uncountable]