The Greek adverb akōlytōs (ἀκωλύτως) means without hindrance, freely, or without obstruction — composed of the alpha-privative and a form of kōlyō (to hinder, forbid). It is Acts' triumphant final word.
Acts 28:31 — proclaiming the kingdom of God... with all boldness and without hindrance — is Acts' closing note. Despite imprisonment, shipwrecks, and persecution, the Word of God is not bound (2 Timothy 2:9). Paul's house arrest becomes a global preaching platform. No earthly power can ultimately halt the advance of the kingdom of God — it moves forward akōlytōs.