An idiot who thinks he is smart. A fool who attempts to teach. In particular, people who assume their success in one area entitles them to respect in another. (etymology: a portmanteau of the words "fraudulent" and "pedant")
"Rush Limbaugh spreads such misinformation he's either a disingenuous, Machiavellian genius or a simple fraudant." , "I can't decide who's a bigger fraudant; Glenn Beck or Donald Trump."