言いい訳わけが立たたない

expression, i-adjective

inexcusable; unjustifiable; admitting no excuse

Used when a situation or action is so clearly wrong that no excuse can be accepted. Often appears in formal or critical contexts.

• 彼かれの遅ち刻こくは言いい訳わけが立たたない。

  His lateness is inexcusable.

• このミスは言いい訳わけが立たたないほど重じゅう大だいだ。

  This mistake is so serious that it admits no excuse.