Synonyms for gloom

noun

1. Heavy shade

   shadow, murk, dimness, dark; see darkness 1.

2. Heavy spirits

   woe, sadness, depression, dejection, melancholy, melancholia, dullness, despondency, misery, sorrow, morbidity, pensiveness, hypochondriasis, catatonia, dolor, malaise, vexation, pessimism, foreboding, low spirits, cheerlessness, heaviness of mind, weariness, apprehension, misgiving, distress, affliction, despair, oppression, anguish, grief, horror, mourning, bitterness, mortification, chagrin, discouragement, disconsolateness, the blues*, the dumps*, the doldrums*, blue funk*.

   Antonyms happiness*, optimism, gaiety.