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treacherous (adj.)

early 14c., from Old French trecheros, tricheros "deceitful" (12c.), from trecheor, tricheor "cheat, deceiver, liar, impostor, trickster," agent noun from trechier, trichier "to cheat, trick" (see trick (n.)). Figuratively, of things, from c. 1600. Related: Treacherously; treacherousness. Middle English had treacher "deceiver, cheat, traitor."

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Definitions of treacherous from WordNet

treacherous (adj.)
dangerously unstable and unpredictable;
treacherous winding roads
Synonyms: unreliable
treacherous (adj.)
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans;
the fiercest and most treacherous of foes
treacherous intrigues
Synonyms: punic / perfidious
From wordnet.princeton.edu

Dictionary entries near treacherous

Travis

travois

trawl

trawler

tray

treacherous

treachery

treacle

tread

treadle

treadmill