/prɪˈzʌmptʃuəs ||; prɪˈzʌmptʃυəs/adj confident that sth will happen or that sb will do sth without making sure first, in a way that annoys people 放肆的；专横的；自以为是的: It was very presumptuous of him to say that I would help without asking me first. 他实在太自作主张了，竟然没有先问问我便说我会帮忙。