TREACHEROUS, a. trech'erous. [See Treachery.] Violating allegiance of faith pledged; faithless; traitorous to the state or sovereign; perfidious in private life; betraying a trust. A man may be treacherous to his country, or treacherous to his friend, by violating his engagements or his faith pledged.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.