Firen-synn
Bosworth & Toller Anglo-Saxon Old English Dictionary - firen-synn
According to the Old English Dictionary:
e ;
- firen-synn
- f. Gross sin :-- Fyrnsynna fruma (the devil), Jul. 347. [O. Sax. firin-sundea.] Cf. firen-leahter, -synnig. firen-synn