ὕπαρνος
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)
ον,
A with a lamb under it, i.e. suckling a lamb or (metaph.) a babe, E.Andr.557, Call.Ap.53; ὕπαρνοι ἀγέλης PLond.3.1171.5 (i B. C.); cf. ὑπόρρηνος.