traître

/tʁɛtʁ/
1.
nounmasculineSing

traitor

person who betrays someone, a group, a cause, or a country

Après avoir livré des documents secrets à l'adversaire, tout le monde l'a traité de traître.

After handing secret documents to the enemy, everyone called him a traitor.

Synonyms:vendu, collabo, transfuge
2.
adjectiveSing

treacherous

deceptive; appearing safe but actually dangerous or deceitful

Fais attention, le sentier est traître après la pluie.

Be careful, the path is treacherous after the rain.

Synonyms:fourbe, insidieux, perfide