perutilis
From LSJ
Latin > English (Lewis & Short)
pĕr-ūtĭlis: e, adj.,
I very useful: opera, Cic. Att. 9, 17, 2.
Latin > French (Gaffiot 2016)
pĕrūtĭlis,¹⁴ e, très utile : Cic. CM 59 ; Off. 3, 49.
Latin > German (Georges)
per-ūtilis, e, sehr nützlich, res (Plur.), Cic. de sen. 59: dixit perutile esse consilium quod Themistocles afferret, sed minime honestum, Cic. de off. 3, 49: in hac enim fortuna perutilis eius et opera et fidelitas esset, Cic. ad Att. 9, 17, 2: illud autem scire perutile est, Boëth. de divis. p. 885, 38 Migne.