1. The state of being alone in solitary isolation
   "The loneliness of the desert was overwhelming";
   - solitariness
    
2. Sadness resulting from being forsaken or abandoned
   "The loneliness of the abandoned puppy was heartbreaking";
   - forlornness, desolation
    
3. A disposition toward being alone
   "She enjoyed periods of loneliness to recharge and reflect";
   - aloneness, lonesomeness, solitariness

Type of: disposition, isolation, sadness, temperament, unhappiness

Encyclopedia: Loneliness