| Sg | Pl | |
| 1st | ? (rule) | þykkjum (rule) |
| 2nd | ?r (rule) | þykkið (rule) |
| 3rd | ?r (rule) | þykkja (rule) |
| Sg | Pl | |
| 1st | ?a (rule) | ?um (rule) |
| 2nd | ?ir (rule) | ?uð (rule) |
| 3rd | þótti (rule) | ?u (rule) |
| Sg | Pl | |
| 1st | þykkjumk (rule) | þykkjumk (rule) |
| 2nd | ?sk (rule) | þykkizk (rule) |
| 3rd | ?sk (rule) | þykkjask (rule) |
| Sg | Pl | |
| 1st | ?umk (rule) | ?umsk (rule) |
| 2nd | ?isk (rule) | ?uzk (rule) |
| 3rd | þóttisk (rule) | ?usk (rule) |
| Sg | Pl | |
| 1 | þykkja (rule) | þykkim (rule) |
| 2 | þykkir (rule) | þykkið (rule) |
| 3 | þykki (rule) | þykki (rule) |
| Sg | Pl | |
| 1 | ?a (rule) | ?im (rule) |
| 2 | ?ir (rule) | ?ið (rule) |
| 3 | ?i (rule) | ?i (rule) |
| Form | |
| Participle | þykkjandi (rule) |
| Past participle | ?r (rule) |
| Middle infinitive | þykkjask (rule) |
| Sg | |
| 2nd | þykkj (rule) |