suaviloquentia
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
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.
