огненно-красный
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
Russian > Greek
πυρρόχροος, πυρρόχρους, πυρρός, πυρσός, πυρρότης, πυρίχρως, πυρώδης, ἐπιφλεγής