improprie
From LSJ
Μιμοῦ τὰ σεμνά, μὴ κακῶν μιμοῦ τρόπους → Graves imitatormores, ne imitator malos → Das Edle nimm zum Vorbild, nicht der Schlechten Art
Latin > English (Lewis & Short)
imprō̆prĭē: (inpr-), adv., v. improprius.
Latin > French (Gaffiot 2016)
imprŏprĭē, improprement : Plin. 10, 29 ; Gell. 17, 1 ; 6, 6, 2.