4 adjectives to describe obscuring

Why is it that we can never hear mention of them without an accompanying feeling, as though a palpable obscure had dimmed the face of things, and that our ancestors wandered to and fro groping!

And drawing near the sunshine of content, Perish obscure to make your glories grow.

Now for the third time again the mother impatient had entered Where were assembled the men, whom anxious but now she had quitted; Spoke of the gathering storm, and the moonlight's rapid obscuring; Then of her son's late tarrying abroad and the dangers of nightfall; Sharply upbraided her friends that without having speech of the maiden, And without urging his suit, they had parted from Hermann so early.

When Nature from the void obscure Her varied world to life awakes, All things find use and so endure: Thus she a poison never makes Without its corresponding cure: Each thing of Nature's careful setting, Each plant that grows in field or grove Hath got its opposite flower or weed; The cure is with the pain decreed; Thus too is found for feverish love 'The bless`ed rapture of forgetting.'

4 adjectives to describe  obscuring