disloyalty

Definitions

The quality or state of being unfaithful to a person, cause, or duty.

An act or instance of failing to be loyal or showing betrayal.

Examples

His act of disloyalty to the company resulted in his immediate termination.

She felt deeply betrayed by her friend's blatant disloyalty during the crisis.

Synonyms

treachery betrayal perfidy infidelity faithlessness treason duplicity

Antonyms

loyalty allegiance faithfulness fidelity devotion constancy steadfastness