per·fid·i·ous /(ˌ)pɝˈfɪdiəs/
  (a.)不誠實的,背信的,有異心的
  Per·fid·i·ous a.
  1. Guilty of perfidy; violating good faith or vows; false to trust or confidence reposed; treacherous; faithless; as, a perfidious friend.
  2. Involving, or characterized by, perfidy. “Involved in this perfidious fraud.”
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  perfidious
       adj : tending to betray; especially having a treacherous character
             as attributed to the Carthaginians by the Romans;
             "Punic faith"; "the perfidious Judas"; "the fiercest
             and most treacherous of foes"; "treacherous intrigues"
             [syn: punic, treacherous]