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Entry 1 sense Webster, 1913

Treacherous

/trĕch'-ẽr-əs/ · Treach·er·ous · IPA /ˈtɹɛt͡ʃəɹəs/
01 a. Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private lif…
  1. 1.
    Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.
    “Loyal father of a treacherous son.” — Shak.
    “The treacherous smile, a mask for secret hate.” — Cowper.
Syn. Faithless; perfidious; traitorous; false; insidious; plotting.