a person who pretends or claims to have more knowledge or skill than he or she possesses; quack.

1595–1605; < Middle French < Italian ciarlatano, equivalent to ciarla(tore) chatterer (derivative of ciarlare to chatter; from imitative root) + (cerre)tano hawker, quack, literally, native of Cerreto, a village in Umbria, known for its quacks

charlatanic [shahr-luh-tan-ik] , charlatanical, charlatanish, charlatanistic, adjective
charlatanically, adverb

impostor, mountebank, fraud, fake, phony. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
charlatan (ˈʃɑːlətən)
someone who professes knowledge or expertise, esp in medicine, that he or she does not have; quack
[C17: from French, from Italian ciarlatano, from ciarlare to chatter]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1611, from It. ciarlatano "a quack," from ciarlare "to prate, babble," from ciarla "chat, prattle," perhaps imitative of ducks' quacking.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

charlatan char·la·tan (shär'lə-tən)
A person fraudulently claiming knowledge and skills not possessed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
While people may not consider us charlatans anymore, they probably think there
  is still too much show and tell and gloss.
Hygienic reformers are usually unequaled in imaginary horrors, except by the
  charlatans who vend panaceas.
They owe to donate time and expose all the anti-Science people for what they
  are charlatans who live from the credulity of fools.
Most thinking people question anything that charlatans say.
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