Something that is loose is not firmly held or fixed in place. If a tooth feels very loose, your dentist may recommend that it's taken out Two wooden beams had come loose from the ceiling She idly pulled at a loose thread on her skirt. + loosely loose·ly Tim clasped his hands together and held them loosely in front of his belly
A loose grouping, arrangement, or organization is flexible rather than strictly controlled or organized. Murray and Alison came to some sort of loose arrangement before he went home He wants a loose coalition of leftwing forces. + loosely loose·ly The investigation had aimed at a loosely organised group of criminals
If your hair is loose, it hangs freely round your shoulders and is not tied back. She was still in her nightdress, with her hair hanging loose over her shoulders
casual and unrestrained in sexual behavior; "her easy virtue"; "he was told to avoid loose (or light) women"; "wanton behavior"
turn loose or free from restraint; "let loose mines"; "Loose terrible plagues upon humanity"