Un-áspringende

According to the Old English Dictionary:

un-áspringende

adj. Unfailing :-- Geunne mé ðæt ðis wæter sý mé tó fulwihtes bæþ unáspringende (fiat mihi haec aqua fons baptismi indeficiens, Homl. Ass. 217, 326), Nar. 46, 9. un-aspringende