Webster's Dictionary 1828
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Treacherously
TREACHEROUSLY, adverb trech'erously. By violating allegiance or faith pledged; by betraying a trust; faithlessly; perfidiously; as, to surrender a fort to an enemy treacherously; to disclose a secret treacherously
You treacherously practic'd to undo me.
First Occurrence in the Bible(KJV): Judges 9:23