charlatan

Etymology

From Middle French charlatan, from Old Italian ciarlatano (“quack”), a blend of ciarlatore (“chatterer”) + cerretano (“hawker, quack”, literally “native of Cerreto”) (Cerreto di Spoleto being a village in Umbria, known for its quacks).

noun

1. (obsolete) A mountebank, someone who addresses crowds in the street; (especially), an itinerant seller of medicines or drugs.
2. A malicious trickster; a fake person, especially one who deceives for personal profit.
   That this disgraceful charlatan holds one of the great offices of state in this country should be a source of constant shame and embarrassment to the Prime Minister. 2018 June, Ian Murray, The Independent