1. quack - Noun
2. quack - Adjective
3. quack - Verb
4. quack - Adjective Satellite
To utter a sound like the cry of a duck.
To make vain and loud pretensions; to boast.
To act the part of a quack, or pretender.
The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
A boastful pretender to medical skill; an empiric; an ignorant practitioner.
Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan.
Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.
Source: Webster's dictionaryNothing is more despicable than a professional talker who uses his words as a quack uses his remedies. François Fénelon
Graphology is another in a long list of quack substitutes for hard work. It is appealing to those who are impatient with such troublesome matters as research, evidence analysis, reasoning, logic, and hypothesis testing. Robert Todd Carroll
(about Dr. Po) Just another quack spouting psychobabble. Eoin Colfer
Communists, socialists and fascists everywhere, from Mr. Obama upward, have taken to the global warming cause like a quack to colored water. Just about every word they utter on this subject is a falsehood calculated to deceive, or - in plain English - a lie. Christopher Monckton
Don't quack like a duck, soar like an eagle. Ken Blanchard
Ducks quack loudly before a rain. German Proverb