He now has the experience and knowledge to navigate the treacherous and tricky waters of a Republican primary contest.
The Afghan leader is treacherous, his government notoriously corrupt.
My book was written as an urgent diagnosis but was taken to be a treacherous insult.
early 14c., from Old French trecheros (12c.), from trecheur, agent noun from trechier "to cheat, trick" (see trick). Figuratively, of things, from c.1600. Related: Treacherously; treacherousness.