Dictionary
treach•er•ous
Pronunciation: (trech'ur-us), [key]—
adj.
1. characterized by faithlessness or readiness to betray trust; traitorous.
2. deceptive, untrustworthy, or unreliable.
3. unstable or insecure, as footing.
4. dangerous; hazardous:
a treacherous climb. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.