1.
[syn: faithlessly, traitorously, treacherously, treasonably, false]
The Collaborative International Dictionary of English v.0.48:
Traitorous \Trai"tor*ous\, a. [Cf. F. tra[^i]treux.]
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]
WordNet (r) 3.0 (2006):
traitorously
adv 1: in a disloyal and faithless manner; "he behaved
treacherously"; "his wife played him false" [syn:
faithlessly, traitorously, treacherously,
treasonably, false]