THE KNOW-IT-ALL - someone who claims to know everything about everything.
A Know-It-All can disrupt your operation from top to bottom. Wanting to be in control, this type of difficult person pay little attention to what others say. She is condescending and irritating. Unlike the Recluse, who keeps his opinions to himself, the Know-It-All is quick to share opinions. If your boss is a Know-It-All, the condescension is especially irritating. Managing a Know-It-All is equally difficult; she readily defies your authority and insults your staff, annoying and alienating co-workers. Because of the Know-It-All's behavior, people don't like her, and her contribution is not what it could be, given her intelligence.