How would you describe a person who "acts like a know it all" or always has to be right?

What characteristics, behaviors, habits, actions do "know it all's" have?

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Oystercult · 41-45, M

They suffer Trauma, that comes from being neglected...during childhood... growing up... and build themselves up trying to overcome this...and they end up being the know it all ..this needs to be recognised... , or best is to hang pout less around em :)