διαπρύσιον
From LSJ
ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving
English (Autenrieth)
adv., reaching far and wide, Il. 17.748; piercingly, ἤῦσεν, Il. 8.227.
Russian (Dvoretsky)
διαπρύσιον: (ῠ) adv.
1) сплошь, насквозь: πρὼν πεδίοιο δ. τετυχηκώς Hom. горный кряж, протянувшийся через всю равнину;
2) пронзительно, громко (ἤϋσεν Hom.; κιθαρίζειν HH).