unhappiness
 不幸福
 Un·hap·py a.
 1. Not happy or fortunate; unfortunate; unlucky; as, affairs have taken an unhappy turn.
 2. In a degree miserable or wretched; not happy; sad; sorrowful; as, children render their parents unhappy by misconduct.
 3. Marked by infelicity; evil; calamitous; as, an unhappy day. “The unhappy morn.”
 4. Mischievous; wanton; wicked. [Obs.]
 -- Un*hap*pi*ly adv. -- Un*hap*pi*ness, n.
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 unhappiness
      n 1: emotions experienced when not in a state of well-being [syn:
            sadness] [ant: happiness]
      2: state characterized by emotions ranging from mild
         discontentment to deep grief [ant: happiness]