空くう論ろん

noun, noun which may take the genitive case particle 'no'

abstract theory; impractical theory; empty theory

Refers to a theory or argument that is detached from reality and cannot be put into practice. Often carries a negative nuance of being unrealistic or useless.

• 彼かれの提てい案あんは空くう論ろんに過すぎない。

  His proposal is nothing more than an impractical theory.

• その計けい画かくは空くう論ろんで終おわった。

  The plan ended up as an empty theory.