Darkness, dimness, or obscurity. / A depressing, despondent, or melancholic atmosphere. / Cloudiness or heaviness of mind; melancholy; aspect of sorrow; low spirits; dullness.

(intransitive) To be dark or gloomy. / (intransitive) To look or feel sad, sullen or despondent. / (transitive) To render gloomy or dark; to obscure; to darken.

plural of gloom

simple past tense and past participle of gloom

present participle of gloom

Twilight of morning or evening; the gloaming. / Gloomy behaviour; melancholy.

(archaic or poetic) gloomy

plural of glooming

(weather, US, Southern California) Any of several gloomy weather conditions present during June mornings, especially conditions of clouds, cool temperatures, fog, or drizzle.

plural of gloom-and-doomer