κακῶς δρᾶν
From LSJ
εἰς τὸν τετρημένον πίθον ἀντλεῖν → run water into a punctured pitcher, to the perforated jar bale water, labour in vain, labor in vain
Greek > English (Woodhouse)
harm, do a bad turn, do in injury, do one a bad turn, evilly entreat, treat ill, use ill