lonely UK /ˈləʊnli/US /ˈloʊnli/adjective 3forms 2phrases 1 adjective3 •feeling cut off from other people and unhappy about itAt last My love has come along My lonely days are over And life is like a song — 1941 •Without companions; solitary.By a lone wall a lonelier column rears. — 1816 •Unfrequented by people; desolate. formslonelier · loneliest Phrases with lonely plough a lonely furrowTo carry out an action in isolation, or in an original way, without any help or support from others.