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A Know it all is an egotist or most likely prideful or egotistical type. Know it all is someone who acts and thinks they know [everything] constantly. And they like to argue with people a lot. If a person is [argumentative] and argues with you so much it makes them a stubborn person and stubborn people like that think they are right about [everything]. A know it all is a hardhead who thinks they are smarter than others.
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