From perfidia (“perfidy”) + -ōsus (“-ous”), from perfidus (“faithless”) + -ia (“-ness”), from per (“through”) + fidēs (“trust”), from Proto-Indo-European *per + Proto-Italic *feiðos from root *bʰeydʰ-.
perfidiōsus (feminine perfidiōsa, neuter perfidiōsum, comparative perfidiōsior); first/second-declension adjective
First/second-declension adjective.
Number | Singular | Plural | |||||
---|---|---|---|---|---|---|---|
Case / Gender | Masculine | Feminine | Neuter | Masculine | Feminine | Neuter | |
Nominative | perfidiōsus | perfidiōsa | perfidiōsum | perfidiōsī | perfidiōsae | perfidiōsa | |
Genitive | perfidiōsī | perfidiōsae | perfidiōsī | perfidiōsōrum | perfidiōsārum | perfidiōsōrum | |
Dative | perfidiōsō | perfidiōsō | perfidiōsīs | ||||
Accusative | perfidiōsum | perfidiōsam | perfidiōsum | perfidiōsōs | perfidiōsās | perfidiōsa | |
Ablative | perfidiōsō | perfidiōsā | perfidiōsō | perfidiōsīs | |||
Vocative | perfidiōse | perfidiōsa | perfidiōsum | perfidiōsī | perfidiōsae | perfidiōsa |