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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.

One who kills, or attempts to kill, by surprise or secret assault; one who treacherously murders any one unprepared for defense.

To kill by surprise or secret assault; to murder by treacherous violence. Help, neighbors, my house is broken open by force, and I am ravished, and like to be assassinated. Dryden.

The act of assassinating; a killing by treacherous violence.

liver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly; as, an officer betrayed the city. Jesus said unto them, The Son of man shall be betrayed into the hands of men. Matt. xvii. 22.

ody is apt to sink; a marsh; a morass. Appalled with thoughts of bog, or caverned pit, Of treacherous earth, subsiding where they tread. R. Jago.

intercourse; transaction; as, to have dealings with a person. Double dealing, insincere, treacherous dealing; duplicity. -- Plain dealing, fair, sincere, honorable dealing; honest, outspoken expression of opinion.

Deceitful; hypocritical; treacherous. Milton.

Having a false heart; deceitful; treacherous. Sandys.

Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous; perfidious; as, a false friend, lover, or subject; false to promises. I to myself was false, ere thou to me. Milton.

Hollow or unsound at the core; treacherous; deceitful; perfidious. Bacon. -- False"*heart`ed*ness, n. Bp. Stillingfleet.

In a false manner; erroneously; not truly; perfidiously or treacherously. "O falsely, falsely murdered." Shak. Oppositions of science, falsely so called. 1 Tim. vi. 20. Will ye steal, murder . . . and swear falsely Jer. vii. 9.

oeth not out of feigned lips. Ps. xvii. 1. -- Feign"ed*ly, adv. -- Feign"ed*ness, n. Her treacherous sister Judah hath not turned unto me with her whole heart, but feignedly. Jer. iii. 10. Feigned issue (Law), an issue produced in a pretended action between two parties for the purpose of trying before a jury a questio…

Characteristic of cats; sly; stealthy; treacherous; as, a feline nature; feline manners.

A grin of civility; a leer. [Obs.] A sly, treacherous fleer on the face of deceivers. South.

Full of fraud, deceit, or treachery; trickish; treacherous; fraudulent; -- applied to persons or things. I. Taylor. -- Fraud"ful*ly, adv.

A framework of sleepers and crossbeams forming a foundation in marshy or treacherous soil.

Lying in wait; watching an opportunity to insnare or entrap; deceitful; sly; treacherous; -- said of persons; as, the insidious foe. "The insidious witch." Cowper.

The disciple who betrayed Christ. Hence: A treacherous person; one who betrays under the semblance of friendship. -- a.

Crafty; cunning; mischievous; wicked; treacherous; lazy.[Archaic] He [the dwarf] was waspish, arch, and litherly. Sir W. Scott.