treacherous

/ˈtrɛtʃərəs/
adjective
  1. Dangerous because of hidden or unpredictable risks; not safe to trust.
    • Driving in heavy fog can be treacherous, even for experienced drivers.
    • The mountain path became treacherous after the ice storm.
    • The river looks calm, but the currents underneath are treacherous.
  2. Guilty of or involving betrayal; not loyal.
    • The treacherous soldier sold military secrets to the enemy.
    • She felt betrayed by her treacherous friend who spread lies about her.
    • The king's treacherous advisor plotted to overthrow him.
What does "treacherous" mean? | whatsthatwordmean | whatsthatwordmean