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Webster 1828 Edition

Treacherously

TREACHEROUSLY

,
adv.
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.

Definition 2024

treacherously

treacherously

English

Adverb

treacherously ‎(comparative more treacherously, superlative most treacherously)

  1. In a treacherous manner.
    The former spy behaved treacherously.

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