οὐαί
From LSJ
λύπης ἰατρός ἐστιν ὁ χρηστὸς φίλος → a true friend is grief's physician, a worthy friend is a physician to your pain
English (LSJ)
exclam. of pain and anger,
A ah! woe! c. nom., LXX Am.5.18, al.: c. voc., ib.3 Ki.13.30: c. dat., οὐαί μοι, οὐαί σοι, woe is me! woe to thee! ib.Nu.21.29, Arr.Epict.3.19.1, Mim.Oxy.413.184: c. acc., οὐαὶ οὐαὶ οὐαὶ τοὺς κατοικοῦντας ἐπὶ τῆς γῆς Apoc.8.13. II οὐαί· φυλαί (Cypr.), Hsch. (Cf. Dor. ὠβά.)
German (Pape)
[Seite 408] vae, weh! Ausruf des Schmerzes und des Unwillens, N. T.; οὐαί μοι, Arr. Epict. 3, 19.