suaviloquentia
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)
suāvĭlŏquentĭa: ae, f. suaviloquens,
I sweetness of speech, suaviloquence: et oratorem appellat (Ennius Cethegum) et suaviloquentiam tribuit, Cic. Brut. 15, 58; cf. suaviloquens.
Latin > French (Gaffiot 2016)
suāvĭlŏquentĭa, æ, f. (suaviloquens), douceur de langage : Enn. d. Cic. Br. 58.