Níd-syn[n]

According to the Old English Dictionary:

(?), e;

níd-syn[n]

f. A sin of violence :-- Hú ic becwom in ðis neowle genip nídsynnum (MS. mid synnum : Grein, níþsynnum) fáh, Cd. Th. 275, 32; Sat. 180. nid-synn