Someone who is disloyal to their friends, family, or country does not support them or does things that could harm them. She was so disloyal to her deputy she made his position untenable loyal. doing or saying things that do not support your friends, your country, or the group you belong to loyal disloyal to
Not loyal; not true to a sovereign or lawful superior, or to the government under which one lives; false where allegiance is due; faithless; as, a subject disloyal to the king; a husband disloyal to his wife
deserting your allegiance or duty to leader or cause or principle; "disloyal aides revealed his indiscretions to the papers