1.
[syn: faithless, traitorous, unfaithful, treasonable, treasonous]
The Collaborative International Dictionary of English v.0.48:
Treasonous \Trea"son*ous\, a.
Treasonable. --Shak.
[1913 Webster]
The treasonous book of the Court of King James.
--Pepys.
[1913 Webster]
WordNet (r) 3.0 (2006):
treasonous
adj 1: having the character of, or characteristic of, a traitor;
"the faithless Benedict Arnold"; "a lying traitorous
insurrectionist" [syn: faithless, traitorous,
unfaithful, treasonable, treasonous]