мрачный

1) General subject: Novemberish, Novembery, adust, as long as a fiddle (о лице), baleful, beetle browed, beetle-browed, black, black as ink, black browed, black-browed, blackfaced, blae, bleak (о выражении лица), cheerless, cloudy, dark, darksome, despondent, dim (о помещении), disconsolate, dismal, dour, downward, dreary, eerie, feral, funebrial, funereal, gaunt, gloomy, glum, gray, grey, grim, grim humour, gruff, gruffy, howling, ill looking, ill-looking, inhospitable, low browed, low-browed, lowering, lowery, lugubrious, lurid, melancholy, mirk, morose, mournful, murk, murky, muzzy (о погоде, месте и т.п.), nighted, nightly, obscure, overcast (о нёбе), sable, saturnine, sepulchral, shadowy, sinister, solemn, solemn (о цвете), somber (sombre), sombre, sombrous, sorry, sour eyed, sour-eyed, spleenful, subfusc, sulky, sullen, sunless, tenebrous, thundery, tristful, woebegone, grave, noir, dystopian, sordid, gravely, dead-and-alive

2) Naval: ugly

3) Colloquial: down in the dumps, downbeat, rusty

4) French: macabre, triste

5) Poetical language: drear

6) Bookish: Stygian, subfuscous

7) Religion: Stygian (Extremely dark, gloomy, or forbidding)

8) Architecture: dingy

9) Scottish language: crook, crooked, glunch

10) Theatre: heavy

11) Jargon: down in the dumps (adv.phr), sad sack, bringdown, sick

12) Oil: sad

13) Makarov: apocalyptic, as black as ink, ghastly, sad (о цвете), sullen (о цвете), surly, tenebrose

14) Archaic: tenebrious

15) Taboo: downbeats