'Gloom' in the Bible

‘Thus says the Lord God, “On the day when Assyria went down to Sheol (the place of the dead) I caused mourning; I closed the deep [subterranean waters] over it and restrained its rivers. And the many waters [that contributed to its prosperity] were held back; and I made [the heart of] Lebanon mourn for it, and all the trees of the field wilted away because of it.