ἐναγωνιστέον

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

Source

Spanish (DGE)

hay que combatir una enfermedad ταῖς ἐμβροχαῖς καὶ τοῖς πιλήμασι mediante linimentos y compresas Orib.Syn.8.16.2.