Níþ-gæst

According to the Old English Dictionary:

es ;

níþ-gæst

m. A malicious, malignant guest :-- Hé ðone níþgæst (the dragon) slóh, Beo. Th. 5391; B. 2699. Under níþgysta (the devils who persecuted Guthlac) nearwum clommum, Exon. Th. 134, 21; Gú. 511. niþ-gæst