IPA: /ˈnɛrəʊnəs/
KK: /ˈnɛroʊnəs/
The quality or state of being limited in width or extent.
The narrowness of the street made it difficult for two cars to pass each other.
Narrowness → It is formed from "narrow" (from Old English "nearwe", meaning tight or constricted) and "-ness" (a suffix indicating a state or quality). The word "narrowness" refers to the state of being tight or constricted.
Think of the Old English word for tightness ('nearwe') to remember that 'narrowness' describes the quality of being tight or constricted.