| Sg. Indef. | þúnautur |
| Sg. Def. | þúnauturinn |
| Pl. Indef. | þúnautar |
| Pl. Def. | þúnautarnir |
| Sg. Indef. | þúnautar; þúnauts |
| Sg. Def. | þúnautarins; þúnautsins |
| Pl. Indef. | þúnauta |
| Pl. Def. | þúnautanna |
| Sg. Indef. | þúnaut; þúnauti |
| Sg. Def. | þúnautnum |
| Pl. Indef. | þúnautum |
| Pl. Def. | þúnautunum |
| Sg. Indef. | þúnaut |
| Sg. Def. | þúnautinn |
| Pl. Indef. | þúnauta |
| Pl. Def. | þúnautana |