infideliter
From LSJ
ἐπάμεροι· τί δέ τις; τί δ' οὔ τις; σκιᾶς ὄναρ ἄνθρωπος → Neverlasting: What is a somebody? What is a nobody? You are a dream of a shadow | Creatures of a day. What is a someone, what is a no one? Man is the dream of a shade.
Latin > English (Lewis & Short)
infĭdēlĭter: adv., v. infidelis.
Latin > French (Gaffiot 2016)
īnfĭdēlĭtĕr,¹⁶ d’une manière peu sûre, peu loyale : Cic. ad Br. 1, 2 ; Vulg. Is. 21, 2.