G0126–ἀΐδιος–aidios

For, from the very creation of the world, His invisible perfections--namely His eternal power and divine nature--have been rendered intelligible and clearly visible by His works, so that these men are without excuse.

ἀΐδιος aidios “eternal”

And angels--those who did not keep the position originally assigned to them, but deserted their own proper abode--He reserves in everlasting bonds, in darkness, in preparation for the judgement of the great day.

ἀϊδίοις aidiois “eternal”