treach·er·ous
[trech-er-uh’s]
adjective
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.
Synonyms
1. unfaithful, faithless, treasonous. 2. deceitful.
Antonyms
1. loyal. 2. reliable.