infidelis (not faithful): infidus (not to be depended on): perfidus: perfidiosus (habitually false, perfidious). To make anybody unfaithful, aliquem fide dimovere; to anybody, aliquem dimovere ab aliquo: to become unfaithful, fidem movere: to be unfaithful to anybody, ab aliquo deficere: aliquem deserere: my memory is unfaithful, memoria labat, mihi non constat, or me deficit: memoria labor: to be unfaithful to one’s duty, ab officio discedere or recedere: to be unfaithful to one’s self, a se desciscere or discedere.