solitary - noun

confinement of a prisoner in isolation from other prisoners

one who lives in solitude

solitary - adjective

• characterized by or preferring solitude
• of plants and animals; not growing or living in groups or colonies
• lacking companions or companionship
• being the only one; single and isolated from others
• devoid of creatures

solitary - thesaurus

alone   hermit   lone   lonely   lonesome   nongregarious   nonsocial   only   recluse   sole   solitudinarian   troglodyte   unfrequented