narrowness n. + Add to list US //ˈnɛɹoʊnəs// UK //nˈæɹəʊnəs// nar·row·ness SynonymsAntonymsEtymology Synonyms narrow mindednessslimness Antonyms broad mindednesswidenessOriginMEnarwenesse→ENnarrowness From Middle English narwenesse; equivalent to narrow + -ness.