λεοντόθυμος
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
German (Pape)
[Seite 28] löwenmuthig, Sp.
Greek (Liddell-Scott)
λεοντόθῡμος: -ον, λεοντόκαρδος, Βυζ.