Abbott-Smith Manual Greek Lexicon
ἀδυνατέω (G101)
2 ἀδυνατέω , -ῶ ( ἀδύνατος ), [in LXX: De 17:8 , Za 8:6 ( פּלא ni.), Jb 42:2 ( בּצר ni.), al.;] Abbott-Smith omits this number to be unable (cl., Philo; π. , v. MM, VGT , s.v.). In LXX and NT (Kennedy, Sources , 124; Hatch, Essays , 4; Field, Notes , 46 f.), to be impossible : Mt 17:20 , Lk 1:37 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain