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
But he was also a charismatic showman with a touch of the charlatan about him, and he loved a good spectacle.
For every self-promoting charlatan, there's a true public servant.
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