Lone
Part of speech: adjective
Definition: Solitary; having no companion. Isolated or lonely; lacking companionship. Sole; being the only one of a type. Situated by itself or by oneself, with no neighbours.
Example sentence: The world has become one big grassy knoll, crawling with lone gunmen who think they're the Warren Commission.
Lonely
Part of speech: adjective
Definition: Of person, unhappy by feelings of loneliness.Of place, unfrequented by people; desolate.Of person, without companions; solitary.
Example sentence: I have so many different personalities in me and I still feel lonely.