Abbott-Smith Manual Greek Lexicon
κατα-μανθάνω (G2648)
1 κατα-μανθάνω , [in LXX: Ge 34:1 ( ראה ), Jb 35:4 ( 5 ) ( שׁוּר ), Si 9:5 , 8 , al.;] to learn thoroughly , observe well , consider carefully (on distinction bet. κ. and μανθάνω , cf. M, Pr. , 117): Mt 6:28 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain