In a fraudulent manner, by fraud, with intent to defraud or deceive, dishonestly, wrongfully.

in a fraudful manner.

In a knavish manner; esp. unscrupulously, villainously, dishonestly.

In an overreaching manner; to an overreaching degree; so as to overreach oneself.

in a cozening manner.

after the manner of a mountebank.

in the manner of a quacksalver.

upon the sham: fraudulently, with deceitful purpose. Obsolete.

slang. That which is not fair and ‘square’: dishonest or fraudulent practices.