desuetus
From LSJ
Latin > English
desuetus desueta, desuetum ADJ :: disaccustomed; that has fallen out of use or become unfamiliar
Latin > English (Lewis & Short)
dēsŭētus: a, um, Part., from desuesco.
Latin > French (Gaffiot 2016)
dēsuētus, a, um, v. desuesco.