| Singular | Plural | |
|---|---|---|
| Nominativ | perfidus, perfidum, perfida | perfida, perfidi, perfidae |
| Genitiv | perfidae, perfidi, perfidi | perfidarum, perfidorum, perfidorum |
| Dativ | perfidae, perfido, perfido | perfidis, perfidissimi |
| Akkusativ | perfidum, perfidam, perfidum | perfida, perfidas, perfidos |
| Ablativ | perfido, perfido, perfida | perfidis, perfidissimi |
| Vokativ | perfide, perfidelis, perfidum, perfida | perfida, perfidi, perfidae |
| Singular | Plural | |
|---|---|---|
| Nominativ | — | — |
| Genitiv | — | — |
| Dativ | — | — |
| Akkusativ | — | — |
| Ablativ | — | — |
| Vokativ | — | — |
| Singular | Plural | |
|---|---|---|
| Nominativ | — | perfidissimi |
| Genitiv | perfidissimi, perfidissimi | — |
| Dativ | — | — |
| Akkusativ | — | — |
| Ablativ | — | — |
| Vokativ | — | perfidissimi |
| Grundform | |
|---|---|
| Positiv | perfide, perfidelis |
| Komparativ | — |
| Superlativ | — |