n. Dim, glimmering shade; deep twilight; cheerless obscurity; darkness: as, the gloom of a forest.n. Hence — A dark place.n. Cloudiness or heaviness of mind; dejection, melancholy, sullenness, and the like, or an aspect indicative of such feelings.n. A depressing or disheartening condition of affairs; a dismal aspect or prospect.n. In gunpowder-manuf., the drying-oven.To appear dimly; be seen in an imperfect or waning light; glimmer; be in darkness or obscurity.To exhibit or produce a somber or melancholy feeling; appear sad, gloomy, or dismal; frown; lower.To darken, or make dark, gloomy, or somber.To fill with gloom or despondency; make gloomy or sad.