adj. fierce
adv. fiercely
n. fierceness, ferocity
v. to make or become fierce

Ahrk fin norok paal graan fod nust hon zindro zaan!
And the fiercest foes rout when they hear triumph's shout!
(Book, Songs of Skyrim)

Fierce or unyielding in battle, fighting to the last; does not connotate viciousness or wildness, as in a fierce animal. See instead fel ‘feral’ or bruniik ‘savage’.

The superlative meaning in the Song of the Dragonborn is implied and should be considered inherent to norok.