"that mixture of pitiless resolution and mountebank mockery"
The Charlatan
Public DomainThe Charlatan - Credit: Pietro Longhi 1757

Mountebank is a synonym for charlatan, and refers to a person practising confidence tricks to obtain money, fame or other advantages through pretense or deception. 

Mountebank comes from the Italian montambanco or montimbanco, based on the phrase monta in banco, literally referring to the action of a seller of dubious medicines getting up on a bench to address his audience of potential customers.