Source : Webster's Revised Unabridged Dictionary (1913)
Treasonable \Trea"son*a*ble\, a.
Pertaining to treason; consisting of treason; involving the
crime of treason, or partaking of its guilt.
Most men's heads had been intoxicated with imaginations
of plots and treasonable practices. --Clarendon.
Syn: Treacherous; traitorous; perfidious; insidious.
--{Trea"son*a*ble*ness}, n. -- {Trea"son*a*bly}, adv.
Source : WordNet®
treasonably
adv : in a disloyal and faithless manner; "he behaved
treacherously"; "his wife played him false" [syn: {faithlessly},
{traitorously}, {treacherously}, {false}]