Noun unhappiness has 2 senses
  1. sadness, unhappiness - emotions experienced when not in a state of well-being
    --1 is a kind of feeling
    --1 has particulars:
     dolefulness; melancholy; misery; forlornness, loneliness, desolation; weepiness, tearfulness; sorrow; sorrow, regret, rue, ruefulness; cheerlessness, uncheerfulness; depression; downheartedness, low-spiritedness, dispiritedness
  2. unhappiness - state characterized by emotions ranging from mild discontentment to deep grief
    --2 is a kind of
    emotional state, spirit
    Antonyms: happiness, felicity
    --2 has particulars: embitterment; sadness, sorrow, sorrowfulness
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