barbarice
From LSJ
Latin > English
barbarice ADV :: barbarously, uncouthly, rudely; like a foreigner, in a foreign language
Latin > English (Lewis & Short)
barbărĭcē: and barbărĭcum, adv., v. barbaricus.
Latin > French (Gaffiot 2016)
barbărĭcē, à la manière des barbares : Capit. Ver. 10, 6.
Latin > German (Georges)
barbaricē, Adv. (barbaricus), barbarisch, Capitol. Ver. 10, 6. Anthim. 64.