| SgM | SgF | SgN | PlM | PlF | PlN | |
| Nom | bjartr | björt (rule) | bjart (rule) | bjartir (rule) | bjartar (rule) | björt (rule) |
| Acc | bjartan (rule) | bjarta (rule) | bjart (rule) | bjarta (rule) | bjartar (rule) | björt (rule) |
| Dat | björtum (rule) | bjartri (rule) | björtu (rule) | björtum (rule) | björtum (rule) | björtum (rule) |
| Gen | bjarts (rule) | bjartrar (rule) | bjarts (rule) | bjartra (rule) | bjartra (rule) | bjartra (rule) |
| SgM | SgF | SgN | Pl | |
| Nom | bjarti (rule) | bjarta (rule) | bjarta (rule) | björtu (rule) |
| Acc | bjarta (rule) | björtu (rule) | bjarta (rule) | björtu (rule) |
| Dat | bjarta (rule) | björtu (rule) | bjarta (rule) | björtum (rule) |
| Gen | bjarta (rule) | björtu (rule) | bjarta (rule) | björtu (rule) |
| Degree | |
| Comp | bjartari (rule) |
| Sup | bjartastr (rule) |