同どう日じつの論ろんではない

expression, i-adjective

not to be spoken of in the same breath; cannot be compared; defying all comparison

Idiomatic expression meaning that two things are so different in quality or scale that they cannot be compared. Often used to emphasize the superiority of one over the other. The literal meaning is 'not a same-day discussion'.

See also: 同日の談ではない

• 彼かれの才さい能のうは私わたしのとは同どう日じつの論ろんではない。

  His talent is not to be spoken of in the same breath as mine.

• この新しん製せい品ひんの性せい能のうは従じゅう来らいのものとは同どう日じつの論ろんではない。

  The performance of this new product defies all comparison with the old one.