treacherous

Adjective
  1. Dangerously unstable and unpredictable (synset 302068530)
    "treacherous winding roads"; "an unreliable trestle"
  2. Tending to betray;
    Especially having a treacherous character as attributed to the Carthaginians by the Romans (synset 300963283)
    "Punic faith"; "the perfidious Judas"; "the fiercest and most treacherous of foes"; "treacherous intrigues"

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