doubletongued
2 occurrences across the corpus
King James Version
1 Timothy 3:8
Likewise must the deacons be grave, not doubletongued, not given to much wine, not greedy of filthy lucre;
KJV Apocrypha (Catholic Deuterocanon)
Sirach (Ecclesiasticus) 28:13
Curse the whisperer and doubletongued: for such have destroyed many that were at peace.