loneliness
noun /ˈləʊnlinəs/
  /ˈləʊnlinəs/
 [uncountable]- a feeling of being unhappy because you have no friends or people to talk to
- a period of loneliness in his life
 - feelings of loneliness and depression
 
 - the fact of a period of time being sad and spent alone
- the loneliness of all those evenings at home just watching TV
 
 - the fact that very few people ever visit a place
- the desolation and loneliness of the island