ἄκαμπτον
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
Russian (Dvoretsky)
ἄκαμπτον: τό
1 негнущаяся часть (δακτύλου Arst.);
2 непреклонность (πρός и εἴς τι Plut.).