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Definition of quack:

  1. A boastful pretender to medical skill; an empiric; an ignorant practitioner.
  2. Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
  3. Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.
  4. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
  5. To act the part of a quack, or pretender.
  6. To make vain and loud pretensions; to boast.
  7. To utter a sound like the cry of a duck.

Synonyms:

faker, charlatan, mountebank, humbug, pretender, phony, false, true, fake, fraud, dishonest, pretentious, unqualified, impostor, dissembling.

Usage examples: