不ふ成せい功こう

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

failure; unsuccessful

Used for attempts, actions, or outcomes that end in failure. Often appears in formal or written contexts.

• 彼かれの計けい画かくは不ふ成せい功こうに終おわった。

  His plan ended in failure.

• 不ふ成せい功こうの原げん因いんを分ぶん析せきする必ひつ要ようがある。

  We need to analyze the cause of the failure.