逆ぎゃっ行こう性せい健けん忘ぼう症しょう

noun

retrograde amnesia

Medical term for loss of memory of events that occurred before a trauma or disease onset.

• 事じ故この後あと、彼かれは逆ぎゃっ行こう性せい健けん忘ぼう症しょうになり、事じ故こ前まえの数すう時じ間かんを思おもい出だせなくなった。

  After the accident, he developed retrograde amnesia and couldn't remember the hours before it.