Abbott-Smith Manual Greek Lexicon
ἀπρόσκοπος (G677)
3 **† ἀπρόσκοπος , -ον ( προσκόπτω ), [in LXX: Si 35 (32):21 , III Mac 3:8 *;] act., not causing to stumble : metaph., of not leading others into sin, I Co 10:32 . Pass., not stumbling , without offence , blameless : Ac 24:16 , Phl 1:10 (for exx., v. MM, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain