perdifficiliter
From LSJ
πάντες γὰρ οἱ λαβόντες μάχαιραν ἐν μαχαίρῃ ἀπολοῦνται → all they that take the sword shall perish with the sword
Latin > English (Lewis & Short)
perdiffĭcĭlĭter: adv., v. perdifficilis.
Latin > French (Gaffiot 2016)
perdiffĭcĭlĭtĕr (perdifficilis), très difficilement : Cic. Ac. 2, 47.