Sin-þyrstende

According to the Old English Dictionary:

sin-þyrstende

ever thirsting :--Alexander tóécan ðæm ðe hé hiénende wæs ǽgðer ge his folc ge óðerra cyninga hé wæs sinþyrstende monnes blódes Alexander humani sanguinis insaturabilis, sive hostium sive etiam sociorum, recentem tamen semper sitiebat cruorem, Ors. 3, 9 ; Swt. 130, 31. sin-þyrstende