adj. Like a quack (fraudulent doctor), or characteristic of quackery.
the GNU version of the Collaborative International Dictionary of English
adj. Like a quack; boasting; characterized by quackery.
The Century Dictionary and Cyclopedia
Like a quack or charlatan; dealing in quackery; humbugging.
Word Usage
"It seemed extraordinary that a woman like Huffington, with a Cambridge education and an exalted status in American society, should need a quackish spiritual adviser."