Definition of unpracticalness in English:

unpracticalness

Pronunciation /(ˌ)ʌnˈpraktɪklnəs/

noun

rare
  • Impracticality.

Origin

Early 19th century; earliest use found in Edward Pusey (1800–1882), Church of England clergyman and theologian. From unpractical + -ness, after practicalness.