Twilight of morning or evening; the gloaming(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "glooming" in a sentence
"But the lord of Bellister sat on, "glooming" morbidly to himself."
"Here and there, too, the dusty-green reaches were pointed by the dark spire of a cypress, alone, in a kind of glooming isolation; here and there a blossoming peach or almond, gaily pink, sent an inexpressible little thrill of gladness to one's heart."
"With one accord they all looked at the stranger, for they had hardly seem him well in the glooming twilight."