Un-gewildelíc

According to the Old English Dictionary:

un-gewildelíc

adj. Not to be subdued, unyielding :-- Hæbbe se mann heardheortnysse and ungewyldelíc mód ... ðonne forsearaþ swíðe hraðe ðæt hálige sǽd on his heortan, Homl. Th. ii. 92, 2. un-gewildelic