The Oxford Thesaurus An A-Z Dictionary of Synonyms - lonelyadj.

1) single, solitary, sole, lone, one; unaccompanied, alone: The lonely survivor of the crash struggled out of the jungle. She walked for miles, lonely and desolate. 2) desolate, uninhabited, deserted, barren: Robinson Crusoe's world was a lonely place. 3) friendless, lonesome, abandoned, outcast, forsaken; solo, hermit-like, eremitic(al) , reclusive, secluded, retiring, withdrawn, unsocial: He felt lonely in the strange city. She leads a lonely existence with only her cat for company.