a prefix, exceedingly, greatly; geysi-újafnt, Edda 11; geysi-glaðr, exceeding glad, Stj. 478; geysi-mörg, very many, Edda 14; þat er þeim geysi-haglig geit, what a wonderful goat, 24; geysi-illa, very badly, Fms. ii. 295; g. kalli, piercing cold, viii. 306; g. feginn, uncommonly glad, Barl. 85; g. mjök, very much, Fb. i. 210; g. mikill, very muckle, 481; g. fagr, wonderfully fair, Olf. 3. 41, and many others:—with nouns, geysi-fól, a big fool, Flov.