ὑπέρλαμπρον
From LSJ
Ὁ μὲν βίος βραχύς, ἡ δὲ τέχνη μακρή, ὁ δὲ καιρὸς ὀξύς, ἡ δὲ πεῖρα σφαλερή, ἡ δὲ κρίσις χαλεπή → Life is short, art long, opportunity fleeting, experience misleading and judgment difficult
Russian (Dvoretsky)
ὑπέρλαμπρον: adv. пронзительно, оглушительно (ὀλολύζειν Dem.).