Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | illutilis |
| Gen. | illutilis |
| Dat. | illutili |
| Acc. | illutilem |
| Abl. | illutili |
| Voc. | illutilis |
| PLURIEL |
| Nom. | illutiles |
| Gen. | illutilĭum |
| Dat. | illutilĭbus |
| Acc. | illutiles |
| Abl. | illutilĭbus |
| Voc. | illutiles |
| SINGULIER |
| Nom. | illutilis |
| Gen. | illutilis |
| Dat. | illutili |
| Acc. | illutilem |
| Abl. | illutili |
| Voc. | illutilis |
| PLURIEL |
| Nom. | illutiles |
| Gen. | illutilĭum |
| Dat. | illutilĭbus |
| Acc. | illutiles |
| Abl. | illutilĭbus |
| Voc. | illutiles |
| SINGULIER |
| Nom. | illutile |
| Gen. | illutilis |
| Dat. | illutili |
| Acc. | illutile |
| Abl. | illutili |
| Voc. | illutile |
| PLURIEL |
| Nom. | illutilĭa |
| Gen. | illutilĭum |
| Dat. | illutilĭbus |
| Acc. | illutilĭa |
| Abl. | illutilĭbus | |