78. herra (lord) is indeclinable in the sg.
Weak Neuters
| Singular | Plural | |
| Nom. | hjart-a (heart) | hjǫrt-u |
| Acc. | hjart-a | hjǫrt-u |
| Dat. | hjart-a | hjǫrt-um |
| Gen. | hjart-a | hjart-na |
Weak Feminines
| Singular | Plural | |
| Nom. | tung-a (tongue) | tung-ur |
| Acc. | tung-u | tung-ur |
| Dat. | tung-u | tung-um |
| Gen. | tung-u | tung-na |
80. So also stjarna (star) pl. stjǫrnur, kirkja (church), gen. plurals stjarna, kirkna.
| Sg. Nom. | ęlli (old age) |
| Acc. | ęlli |
| Dat. | ęlli |
| Gen. | ęlli |