Níþ

According to the Old English Dictionary:

níþ

adj. (?) Vexatious, rancorous :-- Æfǽstum onǽled, níþum nearowrencum (or níþum from preceding word?), Exon. Th. 316, 5; Mód. 44. [Cf. he fell off heffne dun Inntill niþ hellepine. Orm. 13677.] niþ