'Dark' in the Bible

Let their way be dark and slippery, And the angel of Jehovah pursuing them.

I will incline mine ear to a parable: I will open my dark saying upon the harp.

Have respect unto the covenant; For the dark places of the earth are full of the habitations of violence.

I will open my mouth in a parable; I will utter dark sayings of old,

Thou hast laid me in the lowest pit, In dark places, in the deeps.

Shall thy wonders be known in the dark? And thy righteousness in the land of forgetfulness?

He sent darkness, and made it dark; And they rebelled not against his words.

For the enemy hath persecuted my soul; He hath smitten my life down to the ground: He hath made me to dwell in dark places, as those that have been long dead.