dark

1. Having an absolute or (more often) relative lack of light.Examples: "Dark signals should be treated as all-way stop signs."Synonyms: dim, gloomy, doused, out, quenchedAntonyms: bright, light, lit

2. (of colour) Dull or deeper in hue; not bright or light.Examples: "My sister’s hair is darker than mine."; "Her skin grew dark with a suntan."; "Serene, smiling, enigmatic, she faced him with no fear whatever showing in her dark eyes. The clear light of the bright autumn morning had no terrors for youth and health like hers."Synonyms: deep, dark, deep, dull, dusky, full, fuscous, languidAntonyms: bright, light, pale

3. Marked by or conducted with secrecy.Examples: "The first favourite was never heard of, the second favourite was never seen after the distance post, all the ten-to-oners were in the rear, and a dark horse which had never been thought of, and which the careless St. James had never even observed in the list, rushed past the grand stand in sweeping triumph."Synonyms: clandestine, hidden, secret, sinister, surreptitious, covered, concealed, dark

4. (of a time period) Lacking progress in science or the arts.Examples: "The dark ages began after the collapse of the Roman Empire."; "The Greek Dark Ages began after the Bronze Age collapse."; "The age wherein he lived was dark, but he Could not want light who taught the world to see."Synonyms: unenlightened

5. (broadcasting, of a television station) Off the air; not transmitting.