\Trai"tor*ous\, a. [Cf. F. tra[^i]treux.] 1. Guilty of treason; treacherous; perfidious; faithless; as, a traitorous officer or subject. --Shak. 2. Consisting in treason; partaking of treason; implying breach of allegiance; as, a traitorous scheme. -- {Trai"tor*ous*ly}, adv. -- {Trai"tor*ous*ness}, n.