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untrüglich

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

German > Latin

untrüglich, certus (gewiß). – exploratus (ausgemacht). – Untrüglichkeit, z.B. eines Mittels, certum remedium.