Un-gewislíc

According to the Old English Dictionary:

un-gewislíc

adj. Uncertain, unknown, uncommon :-- Wénst ðú ðæt hit hwæt níwes sié oððe hwæthwugu ungewislíces ðæt ðé on becumen is novum credo aliquid inusitatumque vidisti, Bt. 7, 2; Fox 16, 27 note. un-gewislic