adjective.kept within confines: such as

• confined to bed
• confined prisoners

adjective.limited to a particular location

• confined spaces
• a confined compartment

adjective.held captive

• In Scotland, the Countess of Athole, who was lying-in at Edinburgh Castle near the similarly confined Mary, Queen of Scots, is reported to have cast her own birth pangs onto a waiting-woman in the queen's chamber.