See unhappiness in Webster's New World Roget's A-Z Thesaurus II
noun
A feeling or spell of dismally low spirits:
blues, dejection, depression, despondence, despondency, doldrums, dolefulness, downheartedness, dumps, dysphoria, funk, gloom, glumness, heavy-heartedness, melancholy, mope (used in plural), mournfulness, sadness. See feelings, happy
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