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Discover LudwigThe phrase "a quack" is correct and usable in written English.
It is typically used to refer to someone who pretends to be a doctor or an expert in a field without having the necessary qualifications, often in a derogatory manner.
Example: "The so-called specialist turned out to be a quack, offering ineffective treatments that had no scientific basis."
Alternatives: "charlatan" or "fraud".
Exact(58)
Astonished, I asked why he was spending so much time reading a work by someone who was probably a quack.
"She's called a quack — a Question Answer Center," explained an amused Landon Tucker, 14. "My mom's actually trying to be a quack on her free time".
It's a quack diet.
"And he's not a quack".
The noise sounded just like a quack.
Until recently, it was a quack cure.
Dr. Lambert was hardly a quack looking for headlines.
Balckbone was a quack in medicine, necromancy, divination, and procuring.
"With a Baa Baa Here and a Quack There".
Similar(2)
"This is a quacks' charter.
Now that, my friends, beats Football Follies or a quacking duck phone any day.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com