The vitally important may turn out to be the effectively impossible.

Unfortunately, these neutrinos would now be very cold, and so they are effectively impossible to observe directly.

However, the fog made identifying and targeting the enemy positions effectively impossible.

Border controls thereafter strengthened such that, by 1928, even illegal departure was effectively impossible.

Coriolis forces made this effectively impossible, and flying even halfway would usually win a game.

A zero reading was effectively impossible; the lowest he'd ever had before was three.

But she said that made it effectively impossible for the state to enforce any uniform standard.

In addition, the Indians occupied such a large territory that it was effectively impossible to send an army against them.

Art specialists all agree that it is effectively impossible to put an idea like this into practice.

This made further growth of the 328JET fleet effectively impossible.