Bible's own Q & A on State of the Dead

 "What is man?

Q: Shall mortal man be more just than God? Job 4:17

A: O Lord, Thou art our God: let not mortal man prevail against Thee. 2 Chr. 14:11, margin

Thus we find in answer to the question, that the Word of God calls man mortal."

A.T. Jones 

 

 "The difference between Immortal and Mortal. When used as nouns,
immortal means one who is not susceptible to death, whereas mortal means a human. When used as adjectives, immortal means not susceptible to death, whereas mortal means susceptible to death by aging, sickness, injury, or wound."

Diffsense