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Etymology
From.

Adjective

 * 1) mortal, deadly, fatal which causes death; very dangerous to life
 * 2)  mortal; very serious, difficult
 * 1)  mortal; very serious, difficult
 * 1)  mortal; very serious, difficult
 * 1)  mortal; very serious, difficult
 * 1)  mortal; very serious, difficult