The quality or condition of being nappy. In early use: hairiness, shagginess. In later use (chiefly in African-American usage): frizziness of the hair.
Early 17th century; earliest use found in Randle Cotgrave (fl. 1587–?1630), lexicographer. From nappy + -ness.
Obstinacy or disobedience on the part of a horse.
1930s. From nappy + -ness.