The Greek adverb amemptōs (ἀμέμπτως) means "blamelessly" or "without fault" — the manner of living that provides no valid grounds for accusation. From a- (negative) + memphō (to blame, find fault), it describes conduct that is above reproach. The related adjective amemptos (G273) describes a blameless person. The word does not imply sinless perfection but rather integrity of life that cannot be fairly criticized.
Amemptōs sets the standard for Christian character in the community of faith. Paul declares in 1 Thessalonians 2:10 that his ministry team behaved "holy, righteous, and blamelessly [amemptōs]" among the Thessalonians — a claim grounded in observable conduct, not self-assessment alone. This standard of blamelessness is the goal of the spiritual life (1 Thessalonians 3:13; 5:23) — not achieved through human effort but through the sanctifying work of God. The eschatological dimension is crucial: Paul prays that believers will be kept blameless at the coming of Christ, suggesting that amemptōs is ultimately a gift of grace, not earned righteousness.