Disloyal

(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.

Thesaurus Entries

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