From Wiktionary, the free dictionary
Related to German unbändig, Dutch uitbundig. Its shortening, bannig, is more common.
unbannig
- (dated) savagely
- very
Unbannig störmsch.- Very stormy.
- bannig, beestig, bitterlich, böös, förchterlich, gresig, heel, höllsch, lumpsch, richtig, utermaten, verdonnert, verdüvelt, swied