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From LSJ
συνερκτικός γάρ ἐστι καὶ περαντικός, καὶ γνωμοτυπικὸς καὶ σαφὴς καὶ κρουστικός, καταληπτικός τ' ἄριστα τοῦ θορυβητικοῦ → he's intimidative, penetrative, aphoristically originative, clear and aggressive, and superlatively terminative of the obstreperative