perniciose
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)
pernĭcĭōsē: adv., v. perniciosus.
Latin > French (Gaffiot 2016)
pernĭcĭōsē,¹⁶ pernicieusement, d’une manière funeste : Cic. Leg. 2, 13 || -sius Cic. Leg. 3, 32 ; -sissime Aug. Ep. 39.
