double-dealer

double-dealernoun
double-dealers
pl
Translations
Everyone knew he was a double-dealer who betrayed his friends.
Все знали, что он двурушник, предавший своих друзей.
Definitions
A person who pretends to be loyal or honest while secretly acting in a deceitful or treacherous manner.
The politician was exposed as a double-dealer who accepted money from both sides.