The Greek noun aphtharsia means incorruption, imperishability, or immortality. Formed from the negative alpha and phtheirō (to corrupt, destroy), it describes the quality of that which cannot decay or be destroyed. Used of the resurrection body, of God's eternal nature, of the crown of eternal life, and of love for God.
Aphtharsia is the eschatological hope of the gospel. 1 Corinthians 15:53-54: 'the perishable must clothe itself with the imperishable (aphtharsia).' 2 Timothy 1:10: Christ 'has brought life and immortality to light through the gospel.' The entire gospel is the announcement that in Christ, aphtharsia — what only God possessed — has been offered to mortal human beings.