| Sg. Indef. | athvarf |
| Sg. Def. | athvarfið |
| Pl. Indef. | athvörf |
| Pl. Def. | athvörfin |
| Sg. Indef. | athvarfs |
| Sg. Def. | athvarfsins |
| Pl. Indef. | athvarfa |
| Pl. Def. | athvarfanna |
| Sg. Indef. | athvarfi |
| Sg. Def. | athvarfinu |
| Pl. Indef. | athvörfum |
| Pl. Def. | athvörfunum |
| Sg. Indef. | athvarf |
| Sg. Def. | athvarfið |
| Pl. Indef. | athvörf |
| Pl. Def. | athvörfin |