Hypertext Webster Gateway: "treacherous"
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)
treacherous
adj 1: dangerously unstable and unpredictable; "treacherous winding
roads"; "an unreliable trestle" [syn: {unreliable}]
2: tending to betray; especially having a treacherous character
as attributed to the Carthaginians by the Romans; "Punic
faith"; "the perfidious Judas"; "the fiercest and most
treacherous of foes"; "treacherous intrigues" [syn: {punic},
{perfidious}]
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