fideliter
From LSJ
ἐν οἰκίᾳ τυφλῶν καὶ ὁ νυκτάλωψ ὀξυδερκής → even the day-blind is sharp-eyed in a blind house | among the blind, the one-eyed man is king
Latin > English (Lewis & Short)
fĭdēlĭter: adv., v. fidelis.
Latin > French (Gaffiot 2016)
fĭdēlĭtĕr¹¹ (fidelis), d’une manière fidèle, sûre, loyale : Cic. Off. 1, 92 ; Att. 15, 20, 4 || fermement, solidement : Quint. 1, 4, 5 ; 6, 4, 14 ; Plin. 33, 61 ; Hor. Ep. 1, 18, 70 || -lius Plin. Min. Ep. 6, 24, 3 ; Quint. 10, 6, 2 ; -issime Plin. Min. Pan. 56, 2.