Greek: αμεμπτος [amemptos] (Adjective). Without blame. Without reproach. Free of guilt; not subject to blame. Blameless, inculpable, irreproachable, unimpeachable.
αμεμπτος [amemptos] appears 5 times in the NT:
(1) Luke 1: 6
And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless. - αμεμπτοι [amemptoi] Nom. pl. masc.
(2) Philippians 2: 15
That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world; - αμεμπτοι [amemptoi] Nom. pl. masc.
(3) Philippians 3: 6
Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless. - αμεμπτος [amemptos] Nom. sing. masc.
(4) 1 Thessalonians 3: 13
To the end he may stablish your hearts unblameable in holiness before God, even our Father, at the coming of our Lord Jesus Christ with all his saints. - αμεμπτους [amemptous] Accus. pl. fem.
(5) Hebrews 8: 7
For if that first [covenant] had been faultless, then should no place have been sought for the second. - αμεμπτος [amemptos] Nom. sing. fem.