necessarie
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → But for extreme illnesses, extreme remedies, applied with severe exactitude, are the best (Hippocrates, Aphorism 6)
Latin > English (Lewis & Short)
nĕcessārĭē: adv., v. necessarius. 1.
Latin > French (Gaffiot 2016)
nĕcessārĭē, nécessairement, par nécessité, forcément : Cic. Inv. 1, 44