from 862; incorruptibility; genitive case unending existence; (figuratively) genuineness:

KJV-- immortality, incorruption, sincerity.

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862 aphthartos (af'-thar-tos);

from 1 (as a negative particle) and a derivative of 5351; undecaying (in essence or continuance):

KJV-- not (in-, un-) corruptible, immortal.