double-tongued

This double-tongued talker is not unfrequently met with in public meetings.

But the double-tongued man, who blesses God and curses men, what does he receive?

He's let each one think he was alone at the job to bring it round quicker; a double-tongued, double-dealing devil.

Curse the whisperer and double-tongued: for he hath destroyed many that were at peace.