Mountebank

She is abus'd, ſtolne from me, and corrupted / By Spels, and Medicines, bought of Mountebanks

Source: wiktionary

There is nothing ſo impoſſible in Nature, but Mountebanks vvill undertake; nothing ſo incredible but they vvill affirm: Mrs. Bull’s Condition vvas look’d upon as deſperate by all the Men of Art; then Signior Cavallo judged it vvas high time for him to interpoſe, he bragg’d that he had an infallible Ointment and Plaiſter, vvhich being applied to the Sore vvould Cure it in a fevv Days; […]

Source: wiktionary

A personage appears before him with a broad-brimmed hat, such as the students wear at Wittenberg, a wandering clerk, perhaps, or a charlatan Juggler, a mountebank at a fair, who has laid out on a stand a laboratory of ill-assorted jars.

Source: wiktionary

Donne was a mountebank who wrapped up his lack of meaning in hard words.

Source: wiktionary