回かい復ふく不ふ能のう誤あやまり

• エラー

  General term for any error; 回復不能誤り specifically denotes an unrecoverable one.

• 致ち命めい的てきエラー

  Often used interchangeably, but 致命的エラー emphasizes the fatal consequence, while 回復不能誤り focuses on the impossibility of recovery.

Compound of 回復不能 (unrecoverable) and 誤り (error), likely a calque from English 'unrecoverable error' used in computing.