Strong's Concordance

Original word: ἀμέμπτως
Transliteration: amemptós
Definition (short): blamelessly
Definition (full): blamelessly

NAS Exhaustive Concordance

Word Origin: adverb from amemptos
Definition: blamelessly
NASB Translation: blamelessly (1), without blame (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Adverb from amemptos; faultlessly -- blameless, unblamably.

see GREEK amemptos

KJV: Ye are witnesses, and God also, how holily and justly and unblameably we behaved ourselves among you that believe:
NASB: You are witnesses, and so is God, how devoutly and uprightly and blamelessly we behaved toward you believers;
KJV: And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.
NASB: Now may the God of peace Himself sanctify you entirely; and may your spirit and soul and body be preserved complete, without blame at the coming of our Lord Jesus Christ.