treacherous

US /ˈtretʃ.ɚ.əs/
UK /ˈtretʃ.ɚ.əs/
"treacherous" picture
1.

guilty of or involving betrayal or deception

:
•
He was accused of being a treacherous spy.
•
The politician's actions were seen as treacherous by his former allies.
:
perfidiousdisloyalunfaithfultraitoroustreasonous
:
loyalfaithfultrustworthy
2.

presenting hidden or unpredictable dangers

:
•
The mountain pass was treacherous in winter.
•
The icy roads were treacherous for drivers.
:
hazardousperilousdangerousriskyunpredictable
:
safesecureharmless