a. [ Cf. F. traîtreux. ] 1. Guilty of treason; treacherous; perfidious; faithless; as, a traitorous officer or subject. Shak. [ 1913 Webster ]
2. Consisting in treason; partaking of treason; implying breach of allegiance; as, a traitorous scheme. [ 1913 Webster ]
-- Trai"tor*ous*ly, adv. -- Trai"tor*ous*ness, n. [ 1913 Webster ]