DISLOYAL

adj. 25B6; adjective UNFAITHFUL, faithless, false, false-hearted, untrue, inconstant, untrustworthy, unreliable, undependable, fickle; treacherous, traitorous, subversive, seditious, unpatriotic, two-faced, double-dealing, double-crossing, deceitful; dissident, renegade; adulterous; informal back-stabbing, two-timing; poetic/literary perfidious; archaic hollow-hearted.