不ふ動どう心しん

noun

imperturbability; steadfastness; unshakable mind

General term for a mental state of being unshaken by external circumstances; often used in philosophical or spiritual contexts.

• 彼かれはどんな困こん難なんにも動どうじない不ふ動どう心しんを持もっている。

  He has an unshakable mind that is not disturbed by any difficulty.

noun

cool head in an emergency; keeping calm (in a fight)

Specifically used in martial arts to describe maintaining composure and clear judgment under pressure or during combat.

• 武ぶ道どうでは、不ふ動どう心しんが勝しょう敗はいを分わけることもある。

  In martial arts, an unshakable mind can sometimes determine victory or defeat.