lonely -
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"
unsocial not seeking or given to association; being or living without companions; "the unsocial disposition to neglect one's neighbors"
lonely -
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"
unaccompanied (of a state or an event) taking place without something specified occurring at the same time; "a headache unaccompanied by other symptoms"