"quality or condition of being narrow," Middle English narwenesse, from Old English nearuness "narrowness" also "constraint, distress;" see narrow (adj.) + -ness.
the narrowness of the road
frustrated by the narrowness of people's horizons
the problem with achievement tests is the narrowness they impose on students
the attraction of the book is precisely its narrowness of focus
the landslide he had in the electoral college obscured the narrowness of a victory based on just 43% of the popular vote