treacherous
Definitions
Guilty of or involving betrayal or deception.
Hazardous or dangerous, especially due to hidden or unpredictable conditions.
Examples
The hikers were warned that the mountain path becomes treacherous during the winter months.
Driving on the icy roads proved to be a treacherous journey for everyone involved.
Synonyms
deceitful perfidious untrustworthy dangerous hazardous insidious disloyal