Tüchtigkeit
From LSJ
τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
German > Latin
Tüchtigkeit, robur (Stärke). – bonitas (Güte, gute Beschaffenheit). – utilitas. usus (Tauglichkeit; Brauchbarkeit). – virtus (hoher Grad der Vollkommenheit).