EXAMPLES FROM THE WEB FOR QUACK
The one object of the quack doctor is to size you up and see what you "are good for."
When all was said, a man in the presence of this quack did feel in the presence of a great man.
Partridge, cobbler, astrologer, almanac-maker and quack (died 1708).
As for his being a quack doctor, I see no great harm in that.
As a mountebank, a juggler, a quack doctor—I spurned the very idea.
If no pay is asked for the "stuff," the quack is seldom or ever a loser.
"You're the kind that hasn't feathers and doesn't say quack," replied Mally from below.
Cromwell was mad and a quack; Anselm, Becket, Goethe, ditto ditto.
Quack and Dupe, upper side and under of the selfsame substance.
The Cardinal sent an intimation that he would like to see the quack.