Un-rihtwís[u]
Bosworth & Toller Anglo-Saxon Old English Dictionary - un-rihtwís[u]
According to the Old English Dictionary:
(?): -rihtwíse(?), an;
- un-rihtwís[u]
- f. Unrighteousness, iniquity :-- Árfest eallum unrihtwísum (iniquitatibus) ðínum, Ps. Spl. 102, 3. [Icel. ú-réttvísi; f. unrighteousness.] f. un-rihtwisu