dark

(of a source of light) Extinguished.

Deprived of sight; blind.

Transmitting, reflecting, or receiving inadequate light to render timely discernment or comprehension: caliginous, darkling, dim, gloomy, lightless, sombre.

(of colour) Dull or deeper in hue; not bright or light.

Ambiguously or unclearly expressed: enigmatic, esoteric, mysterious, obscure, undefined.

Marked by or conducted with secrecy: hidden, secret; clandestine, surreptitious.

Without moral or spiritual light; sinister, malign.

Conducive to hopelessness; depressing or bleak.

(of a time period) Lacking progress in science or the arts.

Extremely sad, depressing, or somber, typically due to, or marked by, a tragic or undesirable event.

With emphasis placed on the unpleasant aspects of life; said of a work of fiction, a work of nonfiction presented in narrative form, or a portion of either.

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