Lexical Definition

‎ἄμεμπτος‎ ámemptos (am'-emp-tos) blameless G:A
from ‎Α‎ (as a negative particle) and a derivative of ‎μέμφομαι‎

blameless, faultless, unblamable.

Usage: 4 forms in 16 verses
Form Translated As     In Verse(s)
ἄμεμπτοσ faultless Phil.3.6Heb.8.7
ἄμεμπτοι blameless Luke.1.6Phil.2.15
ἀμέμπτουσ blameless 1Thess.3.13
άμεμπτοσ a blameless LXX.Job.1.8
and the blameless one LXX.Job.22.19
blameless LXX.Gen.17.1LXX.Job.2.3LXX.Job.4.17LXX.Job.9.20LXX.Job.11.4LXX.Job.12.4LXX.Job.15.14LXX.Job.22.3LXX.Job.33.9

Abbott-Smith

ἄ-μεμπτος, -ον (< μέμφομσι), [in LXX chiefly for תָּם;]
blameless, free from fault (in π. of a marriage-contract; M, Th., I, 3:13; cf. MM, VGT, s.v.): Lk 1:6, Phl 2:15 3:6, I Th 3:13 (WH, mg., -ως) He 8:7.†
SYN.: ἄμωμος, ἀνέγκλητος, ἀνεπίλημπτος, q.v. (Tr., Syn., § ciii).

Abbott-Smith References

Book Refs
Luke 1:6
Philippians 2:15 · 3:6
1 Thessalonians 3:13
Hebrews 8:7

Liddell-Scott-Jones

ἄμεμπτος, ον,

blameless, without reproach, [Refs 5th c.BC+]; . χρόνου in regard of time, [Refs 5th c.BC+]; . ἐκείνῃ without blame to her, [Refs 1st c.AD+]: comparative -ότερος less blameworthy, [Refs 1st c.AD+]

__2 of things, perfect in its kind, δεῖπνον[Refs 5th c.BC+]. adverb -τως irreproachably, [Refs 5th c.BC+]
__II active, not blaming, well content, ἄμεμπτόν τινα ποιεῖν or ποιεῖσθαι, [Refs 5th c.BC+]adverb -τως, δέχεσθαί τινα[Refs]