Un-geǽsce

According to the Old English Dictionary:

un-geǽsce

adj. That cannot be found out by enquiry, indescribable :-- Se leóma geteáh mid ungeǽscre fyrhtu (inaestimabili pavore) þá heortan þǽra ætstandendra wífa, Gr. D. 284, 20. un-geæsce