| SgM | SgF | SgN | PlM | PlF | PlN | |
| Nom | jafnungr | jöfnung (rule) | jafnungt (rule) | jafnungir (rule) | jafnungar (rule) | jöfnung (rule) |
| Acc | jafnungan (rule) | jafnunga (rule) | jafnungt (rule) | jafnunga (rule) | jafnungar (rule) | jöfnung (rule) |
| Dat | jöfnungum (rule) | jafnungri (rule) | jöfnungu (rule) | jöfnungum (rule) | jöfnungum (rule) | jöfnungum (rule) |
| Gen | jafnungs (rule) | jafnungrar (rule) | jafnungs (rule) | jafnungra (rule) | jafnungra (rule) | jafnungra (rule) |
| SgM | SgF | SgN | Pl | |
| Nom | jafnungi (rule) | jafnunga (rule) | jafnunga (rule) | jöfnungu (rule) |
| Acc | jafnunga (rule) | jöfnungu (rule) | jafnunga (rule) | jöfnungu (rule) |
| Dat | jafnunga (rule) | jöfnungu (rule) | jafnunga (rule) | jöfnungum (rule) |
| Gen | jafnunga (rule) | jöfnungu (rule) | jafnunga (rule) | jöfnungu (rule) |
| Degree | |
| Comp | jafnungari (rule) |
| Sup | jafnungastr (rule) |