Strong’s Greek
G126 — aidios
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀΐδιος
aidios — pronounced ah-id'-ee-os
from 104; everduring (forward and backward, or forward only):--eternal, everlasting. see GREEK for 104
2 occurrences in the KJV.
Romans 1:20
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
Jude 1:6
And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.