Shyster

['ʃaɪstə]

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

Editor: Paula--From WordNet

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

Inputed by Juana

n. [Colloquial.] Rogue, cheat, trickster, knave, shark, sharper, swindler, slyboots; sly, mean fellow.

Typed by Amalia