Lethiferous

Origin

Latin lethifer, letifer, from lethum, letum ("death") + ferre ("to bear, to bring"). Compare French léthifère.

Full definition of lethiferous

Adjective

1. (obsolete) Deadly, lethal.
• 1658, John Robinson, Eudoxa, p. 151 - Those that are really lethiferous are but excrescencies of sin