Strong’s Greek
G3024 — lethe
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
λήθη
lethe — pronounced lay'-thay
from 2990; forgetfulness:--+ forget. see GREEK for 2990
1 occurrence in the KJV.
2 Peter 1:9
But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.