| SgM | SgF | SgN | PlM | PlF | PlN | |
| Nom | ákafr | ákuf (rule) | ákaft (rule) | ákafir (rule) | ákafar (rule) | ákuf (rule) |
| Acc | ákafan (rule) | ákafa (rule) | ákaft (rule) | ákafa (rule) | ákafar (rule) | ákuf (rule) |
| Dat | ákufum (rule) | ákafri (rule) | ákufu (rule) | ákufum (rule) | ákufum (rule) | ákufum (rule) |
| Gen | ákafs (rule) | ákafrar (rule) | ákafs (rule) | ákafra (rule) | ákafra (rule) | ákafra (rule) |
| SgM | SgF | SgN | Pl | |
| Nom | ákafi (rule) | ákafa (rule) | ákafa (rule) | ákufu (rule) |
| Acc | ákafa (rule) | ákufu (rule) | ákafa (rule) | ákufu (rule) |
| Dat | ákafa (rule) | ákufu (rule) | ákafa (rule) | ákufum (rule) |
| Gen | ákafa (rule) | ákufu (rule) | ákafa (rule) | ákufu (rule) |
| Degree | |
| Comp | ákafari (rule) |
| Sup | ákafastr (rule) |