wiseacre
[noun]
Synonyms: smart aleck, know-it-all, *smartass, smarty, smarty-pants, wisecracker, wise guy, wisehead, wisenheimer

[TahlilGaran] English Synonym Dictionary ▲

wiseacre noun

1. a person who is annoying because they are very confident and think they know a lot
   Word 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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[TahlilGaran] English Dictionary ▲