disloyally

Definitions

In a manner that fails to be faithful or loyal to a person, cause, or duty.

In a way that involves betrayal or treachery.

Examples

He acted disloyally by sharing the company's confidential trade secrets with a direct competitor.

The knight was accused of behaving disloyally toward the king during the heat of the battle.

Synonyms

treacherously faithlessly deceitfully falsely unfaithfully perfidiously traitorously

Antonyms

loyally faithfully devotedly steadfastly truthfully honestly dependably