死しに学がく問もん

noun

useless learning; dead knowledge

Refers to knowledge or scholarship that has no practical use or real-world application; often used critically of overly theoretical or pedantic studies.

• 彼かれの研けん究きゅうは死しに学がく問もんだと批ひ判はんされた。

  His research was criticized as useless learning.

• 実じっ社しゃ会かいで役やくに立たたない知ち識しきは死しに学がく問もんに過すぎない。

  Knowledge that is not useful in the real world is nothing but dead scholarship.