lonely in WordNet English dictionary

1. lacking companions or companionship
   "he was alone when we met him"; "she is alone much of the time"; "the lone skier on the mountain"; "a lonely fisherman stood on a tuft of gravel"; "a lonely soul"; "a solitary traveler"
   alone  lone  lonely  solitary 
   
2. characterized by or preferring solitude
   "a lone wolf"; "a lonely existence"; "a man of a solitary disposition"; "a solitary walk"
   lone  lonely  solitary 
   
3. marked by dejection from being alone
   "felt sad and lonely"; "the loneliest night of the week"; "lonesome when her husband is away"; "spent a lonesome hour in the bar"
   lonely  lonesome 
   
4. devoid of creatures
   "a lonely crossroads"; "a solitary retreat"; "a trail leading to an unfrequented lake"
   lonely  solitary  unfrequented