This adverb describes conduct that is beyond blame or reproach, performed in an irreproachable manner. Paul uses it in 1 Thessalonians 2:10 to remind his readers that God and they themselves are witnesses how ὁσίως καὶ δικαίως καὶ ἀμέμπτως—devoutly, righteously, and blamelessly—the apostles behaved among them. In 5:23, Paul prays that God would preserve them entirely, and their spirit, soul, and body be kept sound and blameless (ἀμέμπτως) at Christ's coming. The adverb emphasizes conduct that withstands scrutiny, leaving no grounds for accusation.