The Greek douleia (G1397) means slavery, bondage, or servitude — the condition of being a doulos (slave). In the New Testament it is used of spiritual bondage to sin, fear, and the elemental powers.
Douleia frames one of Paul's most profound contrasts: 'The Spirit you received does not make you slaves (douleia) so that you live in fear again; rather, the Spirit you received brought about your adoption' (Romans 8:15). The cross is the emancipation proclamation of the kingdom — freedom from the douleia of sin, law, and death for the glorious freedom of children of God.