The Greek noun aselgeia (ἀσέλγεια) means "licentiousness, debauchery, sensuality, wantonness" — describing a pattern of unrestrained indulgence in sexual immorality or other sensual excess. The word implies not just sin but a shameless, brazen abandonment of all moral restraint, especially public disregard for decency.
Aselgeia appears in Paul's list of the works of the flesh (Galatians 5:19) as "debauchery" and in Mark 7:22 in Jesus' list of things that defile a person from within. Peter warns that false teachers follow "the corrupt desire of the flesh" and "depravity" (aselgeian) in 2 Peter 2:2, 7. Jude describes it as what Sodom and Gomorrah gave themselves over to (Jude 1:4). The consistent NT witness is that aselgeia is characteristic of the old life that Christ redeems us from — a life of uncontrolled appetite. Spirit-filled life, by contrast, is marked by self-control (Galatians 5:23).