Early 19th century; earliest use found in Edward Pusey (1800–1882), Church of England clergyman and theologian. From unpractical + -ness, after practicalness.
英语词典包含243303条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。