Definition of "shyster"

shyster

/ˈʃaɪs.tə(ɹ)/

noun
plural shysters
1. Someone who acts in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
  Quotations
  True, it was a good advertisement at Boosters' Club lunches, and all the varieties of Annual Banquets to which Good Fellows were invited, to speak sonorously of […] a thing called Ethics, whose nature was confusing but if you had it you were a High-class Realtor and if you hadn't you were a shyster, a piker, and a fly-by-night.
  1922, Sinclair Lewis, chapter 4, in Babbitt, New York, N.Y.: Harcourt, Brace and Company
  I could sue you, Polly. A shyster is a disreputable lawyer. I'm a quack.
  1981, Blake Edwards, S.O.B. (motion picture), spoken by Dr. Irving Finegarten (Robert Preston)
verb
third-person singular simple present shysters, present participle shystering, simple past and past participle shystered
1. (intransitive) To act in a disreputable, unethical, or unscrupulous way, especially in the practice of law and politics.
2. (transitive) To exploit (someone or something) in this way.