τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
P. σχετλίως; see inexorably.
obstinately: Ar. and P. αὐθάδως.
fast, firmly: V. ἐμπέδως, ἀραρότως (also Plato but rare P.).
