treacherous
/ˈtrɛtʃərəs/
adjective
- 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.
- 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.
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