θανατήφορος G2287
thanatḗphoros · than-at-ay'-for-os · Adjective
from (the feminine form of) θάνατος and φέρω; death-bearing, i.e. fatal:--deadly.
1 Occurrence in the King James Bible
James 3:8But the tongue can no man tame; it is an unruly evil, full of deadly poison.