εὐθανάτως

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 (Dvoretsky)

εὐθᾰνάτως: счастливой, легкой смертью, легко Men.