εἰς τὸν τετρημένον πίθον ἀντλεῖν → run water into a punctured pitcher, to the perforated jar bale water, labour in vain, labor in vain
adj.
P. ἀδιάφθορος, ἀδιάφθαρτος.
Pure: P. and V. καθαρός, ἀκήρατος (rare P.), ἀκέραιος; see pure.