雲うん泥でい

noun

great difference; worlds apart

Used in the set phrase 雲泥の差 (うんでいのさ) to describe a vast, almost incomparable difference, like that between clouds and mud. Rarely used outside this phrase.

• 二人ふたりの実じつ力りょくには雲うん泥でいの差さがある。

  There is a world of difference in their abilities.