infeliciter
From LSJ
Τοὺς δούλους ἔταξεν ὡρισμένου νομίσματος ὁμιλεῖν ταῖς θεραπαινίσιν → He arranged for his male slaves to have sex with female slaves at a fixed price (Plutarch, Life of Cato the Elder 21.2)
Latin > English (Lewis & Short)
infēlīcĭter: adv., v. infelix.
Latin > French (Gaffiot 2016)
īnfēlīcĭter,¹³ malheureusement : Ter. Eun. 329 ; Liv. 1, 45, 3 ; 2, 35, 8