'Thick' in the Bible

You came near and stood under the mountain; and the mountain burned with fire to the heart of the sky, with darkness, cloud, and thick darkness.

These words Yahweh spoke to all your assembly on the mountain out of the midst of the fire, of the cloud, and of the thick darkness, with a great voice: and he added no more. He wrote them on two tables of stone, and gave them to me.

But Jeshurun grew fat, and kicked. You have grown fat. You have grown thick. You have become sleek. Then he forsook God who made him, and lightly esteemed the Rock of his salvation.