From The Collaborative International Dictionary of English v.0.44 [gcide]:
Treacherous \Treach"er*ous\, adjective [See {Treacher}.] 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. -- {Treach"er*ous*ly}, adverb -- {Treach"er*ous*ness}, noun
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