black, bleak, daunting, dejecting, disheartening, dismal,
dispiriting, distressing, dreary, funereal, gloomy, heartbreaking,
hopeless, joyless, melancholic, melancholy, mournful, oppressive,
sad, saddening, somber...
A thesaurus is a great place to seek for synonyms of certain
words. There's a great one online @ thesaurus.com