εὐμηχάνως

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

Source

French (Bailly abrégé)

adv.
industrieusement, habilement.
Étymologie: εὐμήχανος.

Russian (Dvoretsky)

εὐμηχάνως: искусно, ловко Plut.