Hypertext Webster Gateway: "treacherously"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Treacherous \Treach"er*ous\, a. [See {Treacher}.]
Like a traitor; involving treachery; violating allegiance or
faith pledged; traitorous to the state or sovereign;
perfidious in private life; betraying a trust; faithless.
Loyal father of a treacherous son. --Shak.
The treacherous smile, a mask for secret hate.
--Cowper.
Syn: Faithless; perfidious; traitorous; false; insidious;
plotting. -- {Treach"er*ous*ly}, adv. --
{Treach"er*ous*ness}, n.
From WordNet (r) 1.7 (wn)
treacherously
adv : in a disloyal and faithless manner; "he behaved
treacherously"; "his wife played him false" [syn: {faithlessly},
{traitorously}, {treasonably}, {false}]
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