永えい久きゅう不ふ変へん

noun, na-adjective, noun which may take the genitive case particle 'no'

eternal and unchanging; permanence

A yojijukugo emphasizing absolute, timeless constancy. Often used in formal or literary contexts to describe principles, truths, or abstract qualities that never change.

• この世せ界かいに永えい久きゅう不ふ変へんなものはない。

  Nothing in this world is eternal and unchanging.

• 彼かれは永えい久きゅう不ふ変へんの愛あいを誓ちかった。

  He vowed eternal and unchanging love.