— treacherously , adv. — treacherousness , n.
/trech"euhr euhs/ , 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.
[ 1300-50; ME trecherous trecher deceiver ( trech ( ier ) to deceive + -er -ER 2 ) + -ous -OUS. Cf. F tricheur trickster ]
Syn. 1. unfaithful, faithless, treasonous. 2. deceitful.
Ant. 1. loyal. 2. reliable.