The Greek word “douleia”

Limited to Rom. 8:15, 21; Gal. 4:24; 5:1; Heb. 2:15, the Greek noun “douleia” meant “bondage” or “slavery.”  This term is always used figuratively in the New Testament.  Douleia is associated with “slavery to sin, law, and death, which continues wherever the redemption through Christ is not yet effective or not yet completed” (Exegetical Dictionary of the New Testament, 1:350).