know-it-all

Noun
  1. Someone who thinks he knows everything and refuses to accept advice or information from others (synset 110259932)
    domain usage: colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
    is a type of: egoist, egotist, swellhead - a conceited and self-centered person
    same as: know-all

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