'Darkened' in the Bible

For even though they knew God [as the Creator], they did not honor Him as God or give thanks [for His wondrous creation]. On the contrary, they became worthless in their thinking [godless, with pointless reasonings, and silly speculations], and their foolish heart was darkened.

“Let their eyes be darkened so that they do not see,And make their backs bend [under their burden] forever.”