(a.) 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.

alienated apostate collaborative deceitful derelict disaffected estranged faithless FALSE fickle heretical inconstant not true to of bad faith perfidious recreant renegade subversive tergiversant tergiversating traitorous treacherous treasonable treasonous trothless unfaithful unloyal unsteadfast untrue untrustworthy