wise·a·cre
noun/ˈwaɪzeɪkə(r)/
/ˈwaɪzeɪkər/
(especially North American English, old-fashioned, informal)- a person who is annoying because they are very confident and think they know a lot
自以为无所不知的人；自以为是的人 Word Originlate 16th cent.: from Middle Dutch wijsseggher ‘soothsayer’, probably from the Germanic base of wit ‘have knowledge’. The assimilation to acre remains unexplained.