arcano
From LSJ
Latin > English
arcano arcanius, arcanissime ADV :: secretly, in confidence; in one's inner thoughts, privately
Latin > English (Lewis & Short)
arcānō: adv., v. arcanus.
Latin > French (Gaffiot 2016)
arcānō¹⁶ (arcanus), en secret, en particulier : Cic. Att. 16, 3, 1 ; Cæs. C. 1, 19, 2.
Latin > German (Georges)
arcānō, s. arcānus a. E.