wiseacre
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 lotWord Originlate 16th cent.: from Middle Dutch wijsseggher ‘soothsayer’, probably from the Germanic base of wit ‘have knowledge’. The assimilation to acre remains unexplained.
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wiseacre