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presumptuous

[prɪˈzʌmptʃuəs]

adj. too confident, in a way that shows a lack of respect for other people

A guest rearranging the host's furniture uninvited

It was presumptuous of him to assume he'd be invited.

"You're So Vain" by Carly Simon

The subject is presumptuous enough to think the song is about him.

presumption n. assumption n. []