あり得うべからざる

expression, pre-noun adjectival

inexcusable; unthinkable; unacceptable

Used to describe something that should not happen or cannot be tolerated, often with a strong moral or logical judgment. Functions as a pre-noun adjectival modifying a noun.

• 彼かれの行こう動どうはあり得うべからざる過あやまちだ。

  His actions are an inexcusable mistake.

expression, pre-noun adjectival

utterly unexpected; totally unforeseen

Describes an event or situation that is completely surprising and beyond what one could have imagined. Also pre-noun adjectival.

• あり得うべからざる事じ態たいが発はっ生せいした。

  An utterly unexpected situation has occurred.