treachery

Willful betrayal of fidelity, confidence, or trust; perfidy.

The act or an instance of such betrayal.

Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy.

Synonyms See perfidious.

Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason.

Deliberate, often calculated, disregard for trust or faith.

The act of violating the confidence of another, usually for personal gain.

Treason.

betrayal of a trust

an act of deliberate betrayal