人じん生せい最さい悪あく

noun which may take the genitive case particle 'no'

worst ... of one's life

Used as a no-adjective to describe the worst experience, event, or thing in someone's life. Often appears in phrases like 人生最悪の日 (the worst day of one's life).

• あの日ひは人じん生せい最さい悪あくの一いち日にちだった。

  That day was the worst day of my life.

• 人じん生せい最さい悪あくの失しっ敗ぱいをしてしまった。

  I made the worst mistake of my life.