まずあり得えない

expression

very improbable; vanishingly unlikely; only with a miracle

Strongly emphasizes that something is almost impossible; often used in informal speech.

• 彼かれが遅ち刻こくするなんて、まずあり得えない。

  It's almost impossible for him to be late.

• この問もん題だいが解とけるのは、まずあり得えない。

  It's vanishingly unlikely that anyone can solve this problem.