εἰκαιολογέω
From LSJ
μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
English (LSJ)
A talk at random, Dosith.p.431 K.
Spanish (DGE)
hablar por hablar Dosith.431.25, Cyr.Al.Apol.Thdt.1 (p.112.9), Dion.Ar.DN 3.2.