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Adjective: treacherous  tre-chu-rus
  1. Dangerously unstable and unpredictable
    "treacherous winding roads";
    - unreliable
  2. Tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans
    "the fiercest and most treacherous of foes"; "treacherous intrigues";
    - punic, perfidious

See also: dangerous, unfaithful, unsafe

Encyclopedia: Treacherous