solitary 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. being the only one; single and isolated from others
   "the lone doctor in the entire county"; "a lonesome pine"; "an only child"; "the sole heir"; "the sole example"; "a solitary instance of cowardice"; "a solitary speck in the sky"
   lone  lonesome  only  sole  solitary 
   
3. characterized by or preferring solitude
   "a lone wolf"; "a lonely existence"; "a man of a solitary disposition"; "a solitary walk"
   lone  lonely  solitary 
   
4. devoid of creatures
   "a lonely crossroads"; "a solitary retreat"; "a trail leading to an unfrequented lake"
   lonely  solitary  unfrequented 
   
5. of plants and animals; not growing or living in groups or colonies
   "solitary bees"
   nongregarious  nonsocial  solitary 
   

1. one who lives in solitude
   hermit  recluse  solitary  solitudinarian  troglodyte 
   
2. confinement of a prisoner in isolation from other prisoners
   "he was held in solitary"
   solitary confinement  solitary