ἐτός
From LSJ
Ὅσον ζῇς, φαίνου, μηδὲν ὅλως σὺ λυποῦ· πρὸς ὀλίγον ἐστὶ τὸ ζῆν, τὸ τέλος ὁ χρόνος ἀπαιτεῖ. → While you live, shine; have no grief at all; life exists only for a short while, and time demands its toll.
English (LSJ)
(A), Adv.
A without reason, in vain, only with neg., οὐκ ἐτός no wonder, Ar.Ach.411,al., Philetaer.5, Anaxil. 30, Pl.R.414e, 568a; οὐκ ἐτὸς ἄρ' ἦσθα δεινὴ καὶ σοφή Ar.Ec.245, cf. Pl.404.
ἐτός (B), ή, όν,
A = ἐτεός, true, Hsch., perh. to be read in Crates Com.8: neut. pl. ἐτά truly, Call.Fr.anon.283.