ὅνυ
From LSJ
καὶ νῦν περὶ ἀρετῆς ὃ ἔστιν ἐγὼ μὲν οὐκ οἶδα, σὺ μέντοι ἴσως πρότερον μὲν ᾔδησθα πρὶν ἐμοῦ ἅψασθαι, νῦν μέντοι ὅμοιος εἶ οὐκ εἰδότι → so now I do not know what virtue is; perhaps you knew before you contacted me, but now you are certainly like one who does not know
English (LSJ)
Arc. and Cypr. for ὅδε, declined like ὁ with addition of -νυ, nom. sg. masc. ὅνυ Inscr.Cypr.141 H., acc. τόνυ ib.140H., dat. τῷνυ Schwyzer664.11 (Orchom. Arc., iv B. C.), acc. pl. neut. τάνυ IG5(2).3.14 (Tegea, iv B. C.), gen. τῶννυ SIG306.59 (ibid., iv B. C.), IG5(2).262.23 (Mantinea, v B. C.), dat. pl. fem. ταῖννυ SIG306.30; also, with -νυν for -νυ, acc. sg. fem. τάννυν, acc. pl. masc. τόσνυν, ib.559.48,49 (Megalopolis, found at Magn. Mae., iii B. C.).