確かっ固こ不ふ抜ばつ

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

determined; steadfast; unshakable

A formal, emphatic yojijukugo describing an unwavering attitude, resolve, or principle. Often used in written or rhetorical contexts.

• 彼かれは確かっ固こ不ふ抜ばつの信しん念ねんを持もって改かい革かくに取とり組くんだ。

  He tackled the reforms with an unshakable conviction.

• 確かっ固こ不ふ抜ばつな態たい度どで交こう渉しょうに臨のぞむ。

  Approach the negotiations with a steadfast attitude.