事じ実じつ上じょう不ふ可か能のう

na-adjective

effectively impossible; practically impossible

Used when something is theoretically possible but so difficult or unlikely that it is treated as impossible in practice.

• この計けい画かくを今いまから実じっ行こうするのは事じ実じつ上じょう不ふ可か能のうだ。

  Carrying out this plan now is effectively impossible.

• そのような条じょう件けんでは、成せい功こうは事じ実じつ上じょう不ふ可か能のうに近ちかい。

  Under such conditions, success is practically impossible.