'Dark' in the Bible

Then I saw that wisdom is better than foolish ways--as the light is better than the dark.

The wise man's eyes are in his head, but the foolish man goes walking in the dark; but still I saw that the same event comes to them all.

All his days are in the dark, and he has much sorrow, pain, disease, and trouble.

In wind it came and to the dark it will go, and with the dark will its name be covered.

Indeed, if a man should live many years, let him rejoice in them all, and let him remember the days of darkness, for they will be many. Everything that is to come will be futility.

Otherwise, when the sun, daylight, moon, or stars turn dark, or when clouds fail to return after the rain