мгновенный

From LSJ

εἰς τετρημένον πίθον ἀντλεῖν → run water into a punctured pitcher, to the perforated jar bale water, labour in vain, labor in vain

Source

Russian > Greek

ταχύς, ἐξαίφνης, ἀμεριαῖος, στιγμιαῖος