adjective

1. that must eventually die all mortal beings
2. of a human being considered as a being who must eventually die
3. of this world
4. of death
5. causing death; deadly; fatal
6. to the death mortal combat
7. not to be pacified a mortal enemy
8. very intense; grievous mortal terror
9. Informal
   1. extreme; very great
   2. very long and tedious
   3. conceivable; possible of no mortal good to anyone
10. Theol. causing spiritual death: said of a sin serious in itself, adequately recognized as such, and committed with full consent of one's will

Etymology: OFr < L mortalis < mors (gen. mortis), death, akin to mori, to die < IE base *mer-, to die, be worn out > murder, Sans marati, (he) dies

noun

adverb