adj. evil
adv. evilly, in an evil manner
n. evilness; evil
v. to make or become evil

Dovahkiin, Dovahkiin, naal ok zin los vahriin, wah dein vokul mahfaeraak ahst vaal!
Dragonborn, Dragonborn, by his honor is sworn, To keep evil forever at bay!
(Book, Songs of Skyrim)

Kendov krif ok kosil Vokul, nuz jun Gaar niin nau ok hokoron.
The warrior fights his inner evils, but the king unleashes them on his enemies.
(Word Wall for Gaar, Cyclone)

Moral evil, more prominently used by Nords than dragons, whose morals are based on strength and truth.

From kul ‘good’ with the prefix vo- ‘un-, opposite of’.