Gydig

According to the Old English Dictionary:

gydig

adj. Possessed by an evil spirit, mad :-- Þæne gidian limphaticum, s. Saul (gy[digne], þæne gidigan limphaticum, i. vecordem, Hpt. Gl. 520, 63: cf. limphaticum wódan, Wrt. Voc. ii. 53, 56), An. Ox. 5009. Cf. god. gydig