Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | perfidelis |
| Gen. | perfidelis |
| Dat. | perfideli |
| Acc. | perfidelem |
| Abl. | perfideli |
| Voc. | perfidelis |
| PLURIEL |
| Nom. | perfideles |
| Gen. | perfidelĭum |
| Dat. | perfidelĭbus |
| Acc. | perfideles |
| Abl. | perfidelĭbus |
| Voc. | perfideles |
| SINGULIER |
| Nom. | perfidelis |
| Gen. | perfidelis |
| Dat. | perfideli |
| Acc. | perfidelem |
| Abl. | perfideli |
| Voc. | perfidelis |
| PLURIEL |
| Nom. | perfideles |
| Gen. | perfidelĭum |
| Dat. | perfidelĭbus |
| Acc. | perfideles |
| Abl. | perfidelĭbus |
| Voc. | perfideles |
| SINGULIER |
| Nom. | perfidele |
| Gen. | perfidelis |
| Dat. | perfideli |
| Acc. | perfidele |
| Abl. | perfideli |
| Voc. | perfidele |
| PLURIEL |
| Nom. | perfidelĭa |
| Gen. | perfidelĭum |
| Dat. | perfidelĭbus |
| Acc. | perfidelĭa |
| Abl. | perfidelĭbus | |