DICT.TW Dictionary Taiwan

 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.

 mortal enemy
      n : an enemy who wants to kill you