| SgM | SgF | SgN | PlM | PlF | PlN | |
| Nom | fœrr | fœr (rule) | fœrt (rule) | fœrir (rule) | fœrar (rule) | fœr (rule) |
| Acc | fœran (rule) | fœra (rule) | fœrt (rule) | fœra (rule) | fœrar (rule) | fœr (rule) |
| Dat | fœrum (rule) | fœrri (rule) | fœru (rule) | fœrum (rule) | fœrum (rule) | fœrum (rule) |
| Gen | fœrs (rule) | fœrrar (rule) | fœrs (rule) | fœrra (rule) | fœrra (rule) | fœrra (rule) |
| SgM | SgF | SgN | Pl | |
| Nom | fœri (rule) | fœra (rule) | fœra (rule) | fœru (rule) |
| Acc | fœra (rule) | fœru (rule) | fœra (rule) | fœru (rule) |
| Dat | fœra (rule) | fœru (rule) | fœra (rule) | fœrum (rule) |
| Gen | fœra (rule) | fœru (rule) | fœra (rule) | fœru (rule) |
| Degree | |
| Comp | fœrari (rule) |
| Sup | fœrastr (rule) |