G2217–ζόφος–zophos

You have not come to a mountain which may be touched, and is burning with fire, and to a black cloud, and a dark smoke, and a violent wind,

ζόφῳ zophō “to gloom”

For if God did not have pity for the angels who did evil, but sent them down into hell, to be kept in chains of eternal night till they were judged;

ζόφου zophou “of gloomy darkness”

These are fountains without water, and mists before a driving storm; for whom the eternal night is kept in store.

ζόφος zophos “gloom”

And the angels who did not keep to their kingdom but went out from the place which was theirs, he has put in eternal chains and in dark night till the great day of the judging.

ζόφον zophon “darkness”

Violent waves of the sea, streaming with their shame, wandering stars for whom the darkest night is kept in store for ever.

ζόφος zophos “gloom”