The Oxford Thesaurus An A-Z Dictionary of Synonyms - gloom n.

1) shadowiness, gloominess, shade, shadow, murkiness, murk, dimness, dusk, dullness, dark, darkness, cloudiness, blackness, obscurity: We arose in the gloom of a midwinter's morning. 2) despondency, depression, sadness, dejection, downheartedness, melancholy, woe, sorrow, moroseness, desolation, low spirits, blues, doldrums, despair, dolour, misery, Colloq dumps: The team suffered the gloom of defeat.