a person who pretends or claims to have more knowledge or skill than he or she possesses; quack.
Origin: 1595–1605; < Middle French < Italianciarlatano, equivalent to ciarla(tore) chatterer (derivative of ciarlare to chatter; from imitative root) + (cerre)tano hawker, quack, literally, native of Cerreto, a village in Umbria, known for its quacks