Grornian

According to the Old English Dictionary:

grornian

Add :-- Grornodon murmurabant, Ps. Vos. 105, 25. [Nénig man hine geseah swíðe grorniende ac hé á heofonlice blisse ber on his onseóne, Angl. x. 147, 256.] [O. Sax. grornón.] Cf. gnornian. grornian