空くう理り空くう論ろん

noun

impractical theory; empty theory; academic discussion divorced from reality

A yojijukugo used to criticize ideas or arguments that are logically consistent but lack practical application or real-world grounding. Often carries a negative connotation of being out of touch.

• 彼かれの提てい案あんは空くう理り空くう論ろんに過すぎず、現げん場ばでは全まったく役やくに立たたない。

  His proposal is nothing but empty theory and is completely useless in the field.

• 空くう理り空くう論ろんを振ふり回まわすより、まずは実じっ行こうしてみることが大たい切せつだ。

  Rather than brandishing impractical theories, it's more important to try putting things into practice first.