shyster

An unethical, unscrupulous practitioner, especially of law.

One who does business trickily; a person without professional honor: used chiefly of Iawyers: as, pettifoggers and shysters.

A trickish knave; one who carries on any business, especially legal business, in a mean and dishonest way.

Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.

a person (especially a lawyer or politician) who uses unscrupulous or unethical methods