WordWeb Online

1. The state of being sad
   "she tired of his perpetual sadness";
   - sorrow, sorrowfulness, tristesse [literary]
    
2. The quality of excessive mournfulness and uncheerfulness
   - gloominess, lugubriousness, tristesse [literary]
    
3. Emotions experienced when not in a state of well-being
   - unhappiness

Type of: feeling, uncheerfulness, unhappiness

Encyclopedia: Sadness