ファクターＸ

noun

unknown factor; X factor; mystery element

Wasei-eigo term used to refer to an unknown or unpredictable variable that influences an outcome, similar to 'X factor' in English.

wasei-eigo (Japanese-coined English), from factor X

• 成せい功こうにはファクターＸが存そん在ざいする。

  There is an unknown factor in success.

• この事じ件けんの鍵かぎはファクターＸだ。

  The key to this case is the X factor.