| SgM | SgF | SgN | PlM | PlF | PlN | |
| Nom | heilagr | heilag (rule) | heilagt (rule) | heilagir (rule) | heilagar (rule) | heilag (rule) |
| Acc | heilagan (rule) | heilaga (rule) | heilagt (rule) | heilaga (rule) | heilagar (rule) | heilag (rule) |
| Dat | heilugum (rule) | heilagri (rule) | heilugu (rule) | heilugum (rule) | heilugum (rule) | heilugum (rule) |
| Gen | heilags (rule) | heilagrar (rule) | heilags (rule) | heilagra (rule) | heilagra (rule) | heilagra (rule) |
| SgM | SgF | SgN | Pl | |
| Nom | heilagi (rule) | heilaga (rule) | heilaga (rule) | heilugu (rule) |
| Acc | heilaga (rule) | heilugu (rule) | heilaga (rule) | heilugu (rule) |
| Dat | heilaga (rule) | heilugu (rule) | heilaga (rule) | heilugum (rule) |
| Gen | heilaga (rule) | heilugu (rule) | heilaga (rule) | heilugu (rule) |
| Degree | |
| Comp | heilagari (rule) |
| Sup | heilagastr (rule) |