λήθειν ποιῶν τι
From LSJ
διὰ λαμπροτάτου βαίνοντες ἁβρῶς αἰθέρος → passing lightly through clear-shining air (Euripides, Medea 829)
Greek > English (Woodhouse)
do a thing imperceptibly, do a thing unconsciously, do a thing unobserved, do a thing unperceived, do a thing unwittingly