barbarice
From LSJ
ἐξ ὀνύχων λέοντα τεκμαίρεσθαι → judge by the claws, judge by a slight but characteristic mark, small traits give the clue to the character of a person, deduce something from a small indication, identify a lion from its claws
Latin > English (Lewis & Short)
barbărĭcē: and barbărĭcum, adv., v. barbaricus.
Latin > French (Gaffiot 2016)
barbărĭcē, à la manière des barbares : Capit. Ver. 10, 6.