char·la·tan 
(shärlə-tən)
(shärlə-tən)n.
A person who makes elaborate, fraudulent, and often voluble claims to skill or knowledge; a quack or fraud.
[French, from Italian ciarlatano, probably alteration (influenced by ciarlare, to prattle) of cerretano, inhabitant of Cerreto, a city of Italy once famous for its quacks.]
char′la·tanic (-tănĭk), char′la·tani·cal adj.
charla·tan·ism, charla·tan·ry n.