втихомолку

From LSJ

Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → But for extreme illnesses, extreme remedies, applied with severe exactitude, are the best (Hippocrates, Aphorism 6)

Source

Russian > Greek

λάθρᾳ, λάθρῃ, λάθρα, λάθρη