ζῆσις
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
English (LSJ)
εως, ἡ, vitalization, Dam.Pr.83bis.
Greek (Liddell-Scott)
ζῆσις: -εως, ζωή, Στοβ. Ἐκλ. Φυσ. 262.