Ask at the forum if you have an Ancient or Modern Greek query!

καθ’

Φιλοκαλοῦμέν τε γὰρ μετ' εὐτελείας καὶ φιλοσοφοῦμεν ἄνευ μαλακίας -> Our love of what is beautiful does not lead to extravagance; our love of the things of the mind does not makes us soft.
Τhucydides, 2.40.1

Greek (Liddell-Scott)

καθ’: ἱδίαν (= κατ’ ἰδίαν), Ἐπιγρ. Ἀθηνῶν τοῦ Β΄ π.Χ. αἰῶνος, CIA. II. 436 κ. ἀλλ.

French (Bailly abrégé)

p. κατά, dev. un esprit rude.