Dark  —adj. 1 with little or no light. 2 of deep or sombre colour. 3 (of a person) with dark colouring. 4 gloomy, dismal. 5 evil, sinister. 6 sullen, angry. 7 secret, mysterious. 8 ignorant, unenlightened. —n. 1 absence of light. 2 lack of knowledge. 3 dark area or colour, esp. In painting.  after dark after nightfall. The dark ages (or age) 1 period of european history from the 5th–10th c. 2 period of supposed unenlightenment. In the dark 1 lacking information. 2 with no light.  darkish adj. Darkly adv. Darkness n. [old english]