ожесточенно

From LSJ

Quibus enim nihil est in ipsis opis ad bene beateque vivendum → Every age is burdensome to those who have no means of living well and happily

Cicero, de Senectute

Russian > Greek

ἀδιαλύτως, ἐκθύμως, ἐσσυμένως, σκληρῶς