Abbott-Smith Manual Greek Lexicon
ἀ-μέμπτως (G274)
2 ἀ-μέμπτως , adv. ( ἄμεμπτος ), [in LXX: Es 3:13 *;] blamelessly (Lft., Notes , 28, 89; MM, VGT , s.v. -ος ): I Th 2:10 3:13 WH mg., 5:23.†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain