Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | fastuosus |
| Gen. | fastuosi |
| Dat. | fastuoso |
| Acc. | fastuosum |
| Abl. | fastuoso |
| Voc. | fastuose |
| PLURIEL |
| Nom. | fastuosi |
| Gen. | fastuosōrum |
| Dat. | fastuosis |
| Acc. | fastuosos |
| Abl. | fastuosis |
| Voc. | fastuosi |
| SINGULIER |
| Nom. | fastuosă |
| Gen. | fastuosae |
| Dat. | fastuosae |
| Acc. | fastuosam |
| Abl. | fastuosā |
| Voc. | fastuosă |
| PLURIEL |
| Nom. | fastuosae |
| Gen. | fastuosārum |
| Dat. | fastuosis |
| Acc. | fastuosas |
| Abl. | fastuosis |
| Voc. | fastuosae |
| SINGULIER |
| Nom. | fastuosum |
| Gen. | fastuosi |
| Dat. | fastuoso |
| Acc. | fastuosum |
| Abl. | fastuoso |
| Voc. | fastuosum |
| PLURIEL |
| Nom. | fastuosa |
| Gen. | fastuosōrum |
| Dat. | fastuosis |
| Acc. | fastuosa |
| Abl. | fastuosis | |