不ふ倶ぐ戴たい天てんの敵てき

expression, noun

mortal enemy; sworn enemy; nemesis

A strong, literary set phrase for an irreconcilable enemy one cannot coexist with under the same sky. Often used in dramatic or historical contexts.

• 彼かれは私わたしにとって不ふ倶ぐ戴たい天てんの敵てきだ。

  He is my mortal enemy.

• あの一いち族ぞくとは不ふ倶ぐ戴たい天てんの敵てきの関かん係けいにある。

  We have a sworn-enemy relationship with that clan.