Mor·tal a.
1. Subject to death; destined to die; as, man is mortal.
2. Destructive to life; causing or occasioning death; terminating life; exposing to or deserving death; deadly; as, a mortal wound; a mortal sin.
3. Fatally vulnerable; vital.
Last of all, against himself he turns his sword, but missing the mortal place, with his poniard finishes the work. --Milton.
4. Of or pertaining to the time of death.
Safe in the hand of one disposing Power,
Or in the natal or the mortal hour. --Pope.
5. Affecting as if with power to kill; deathly.
The nymph grew pale, and in a mortal fright. --Dryden.
6. Human; belonging to man, who is mortal; as, mortal wit or knowledge; mortal power.
The voice of God
To mortal ear is dreadful. --Milton.
7. Very painful or tedious; wearisome; as, a sermon lasting two mortal hours. [Colloq.]
Mortal foe, Mortal enemy, an inveterate, desperate, or implacable enemy; a foe bent on one's destruction.