Definition of "Narrowness" :

noun: a small margin

"The landslide he had in the electoral college obscured the narrowness of a victory based on just 43% of the popular vote."

noun: the property of being narrow; having little width

"The narrowness of the road."

noun: a restriction of range or scope

"The problem with achievement tests is the narrowness they impose on students."

noun: an inclination to criticize opposing opinions or shocking behavior