ἐτώσιος
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
English (LSJ)
ον, (ἐτός A) Ep. Adj.
A to no purpose, fruitless, βέλος ὠκὺ ἐ. ἔκφυγε χειρός Il.14.407; ἐτώσια πίπτει ἔραζε [βέλεα] 17.633; τὰ δὲ πάντα ἐ. θῆκεν Ἀθήνη made them fruitless, Od.22.256; δῶρα δ' ἐ. ταῦτα χαρίζεο 24.283; useless, unprofitable, ἐ. ἄχθος ἀρούρης Il.18.104; ἐ. πόλλ' ἀγορεύειν Hes.Op.402; ἔργον ἐ. λιπεῖν to leave it undone, ib. 440; ἐτώσια χερσὶ προδεικνύς, i.e. making mere feints, not real blows, Theoc.22.102: masc., first in Id.25.236 (ὀϊστός): fem., Orph.L. 539: neut. ἐτώσιον, as Adv., Id.A.700; pl., ἐτώσια γηράσκοντας A.R. 2.893, cf. Theoc.1.38: regul. Adv. -ίως Sch.Ar.Ec.246.
