2. (n.) a charlatan, boastful pretender or quack
3. (intr.v.) to operate, behave or act like a charlatan or mountebankUSAGE EXAMPLE 1 :The mountebank was arrested by the police on charges of selling drugs without prescriptions.
USAGE EXAMPLE 2 :It somehow comes as no surprise to discover that this prince of mountebanks was also a close friend of the Duke of Windsor.