Green’s Dictionary of Slang

quack adj.

also quacking
[quack n.1 (1a)]

pertaining to a charlatan doctor or his medicines; occas. ext. to other professions.

[UK]J. Wilson Cheats II i: They’re a company of quacking fools [...] Hang this foisting – I’ll trust ne’er a doctor of them all.
[UK]Head Nugae Venales 305: Quacking Doctors and Hangmen, who kill without being called in question.
[UK]J. Floyer Essay to Prove Cold Bathing 321: I believe Cold Bathing can never be made a Quack Medicine.
[UK] ‘Poem on the Taking of St. Mary’s’ Collection of Eng. Poetry II (1716) 1: One that himself knew how to Rule, As a Quack Doctor does his Fool.
[UK] in D’Urfey Pills to Purge Melancholy IV 166: Quacking Physicians shou’d / Give Money freely.
C. Lucas Essay on Waters Pt 3 138: A common quack-bill; in which some disguised drugg [...] is most pompously extolled.
[UK]‘Peter Pindar’ ‘Peter’s Prophecy’ Works (1794) II 130: To cure, like all quack med’cines, all complaints!
[UK]C. Dibdin Yngr Song Smith 135: I wonder, among all our quack pills and drops, we haven’t a cure for it.
[UK]Marryat Mr Midshipman Easy II 279: He had taken a peculiar fancy to a quack medicine, called Enouy’s Universal Medicine for all Mankind.
[US]T. Haliburton Sam Slick’s Wise Saws I 172: The Captain is fonder of quack medicines than Babboon, the Frenchman.
[US]‘Artemus Ward’ Among the Mormons in Complete Works 1865) (1922) 275: The Goddess hasn’t bin very well durin’ the past few years, and the num’ris quack doctors she called in didn’t help her any.
[UK]G.A. Sala My Diary in America I 397: The mountebank puffs his quack pills with texts from the Bible.
[US]G.A. Brine letter July 3 in Ribton-Turner (1887) n.p.: I have been in the employ (for two years together) of manslaughtering quack doctors – four different ones.
[UK]M. Davitt Leaves from a Prison Diary I 40: ‘Is this a real discovery, or merely a quack nostrum?’ I ventured to inquire.
[UK]‘Bartimeus’ ‘A Picturesque Ceremony’ Naval Occasions 240: I remember – what they call in the quack advertisements ‘That Sickish Feeling!’.
[US]S. Lewis Arrowsmith 196: Instead of his sticking to decent regular practice, you’ll be hearing of his opening a quack sanitorium.
[UK]Auden & Isherwood Ascent of F6 I i: Virtue. Knowledge. We have heard these words before; and we shall hear them again – during the nursery luncheon, on the prize-giving afternoon, in the quack advertisement.
[UK]E. Cross Tailor and Ansty 193: He was what they call in this country a quack doctor. This is a doctor who has all the old tradional learning.
[UK]J. Osborne World of Paul Slickey Act II: There is far too much nonsense talked in this quack kind of psychology.
[Ire]H. Leonard Out After Dark 183: Irish drama critics were in those days [...] a breed of quack psychoanalysts.
[US]J. Ellroy ‘Hot-Prowl Rape-O’ Destination: Morgue! (2004) 269: My buddy was a quack herb doc.