Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | perfacundus |
| Gen. | perfacundi |
| Dat. | perfacundo |
| Acc. | perfacundum |
| Abl. | perfacundo |
| Voc. | perfacunde |
| PLURIEL |
| Nom. | perfacundi |
| Gen. | perfacundōrum |
| Dat. | perfacundis |
| Acc. | perfacundos |
| Abl. | perfacundis |
| Voc. | perfacundi |
| SINGULIER |
| Nom. | perfacundă |
| Gen. | perfacundae |
| Dat. | perfacundae |
| Acc. | perfacundam |
| Abl. | perfacundā |
| Voc. | perfacundă |
| PLURIEL |
| Nom. | perfacundae |
| Gen. | perfacundārum |
| Dat. | perfacundis |
| Acc. | perfacundas |
| Abl. | perfacundis |
| Voc. | perfacundae |
| SINGULIER |
| Nom. | perfacundum |
| Gen. | perfacundi |
| Dat. | perfacundo |
| Acc. | perfacundum |
| Abl. | perfacundo |
| Voc. | perfacundum |
| PLURIEL |
| Nom. | perfacunda |
| Gen. | perfacundōrum |
| Dat. | perfacundis |
| Acc. | perfacunda |
| Abl. | perfacundis | |