ὑπογυίως

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

Russian (Dvoretsky)

ὑπογυίως: и ὑπογύως недавно: τὸ ὑπογυιότατον Isocr. и τὰ ὑπογυιότατα Dem. совсем недавно.