διαπληκτικός

From LSJ

Ἐρωτώμενος διὰ τί ὀλίγους ἔχει μαθητάς, ἔφη ὅτι ἀργυρέᾳ αὐτοὺς ἐκβάλλω ῥάβδῳ → When asked why he had so few pupils, he replied ‘I chase them away with a silver stick (Diogenes Laertius 6.4.5, on the philosopher Antisthenes)

Source

Spanish (DGE)

-ή, -όν
contundente, eficaz πάντων δὲ διαπληκτικώτατον καὶ ἀνυσιμώτατόν ἐστι καστόριον Orib.Ec.72.2.