What does "mountebank" mean?

Mountebank: Any boastful or false pretender; a charlatan; a quack. Nothing so impossible in nature but mountebanks will undertake. Arbuthnot.

Additional senses

  1. 2.To cheat by boasting and false pretenses; to gull. [R.] Shak.
  2. 3.To play the mountebank.

Sources