shy·ster /ˈʃaɪstɚ/
  訟棍
  Shy·ster n.  A trickish knave; one who carries on any business, especially legal business, in a mean and dishonest way. [Slang, U.S.]
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  shyster
       n : a person (especially a lawyer or politician) who uses
           unscrupulous or unethical methods [syn: pettifogger]