Besides, for nearly half a century, terrorism had proven impervious to conciliatory, United Nation sstyle diplomacy.

Indonesia's tourist industry is in tatters, but its consumer economy has proved somewhat impervious to terrorist fears, economists say.

A.: Since it was first approved in 1811, Manhattan's grid plan has proven impervious to all but a few attempts to improve on it.

Both prove impervious to the investigations of scientists.

Described as impacting with sufficient force to "destroy mountains," with only primary adamantium proving too impervious.

Lui tried to tear the picture but it proved impervious as the curse of the evil nun is still in there.

The question is: Will the German-American bonds that the cold war forged prove impervious to this change?

It also proved impervious to the Lexx' planet-shattering weapon.

It does not, however, prove impervious to the space warping effect of the Vortex.

Ms. Heaviside thinks she knows why the image has proved relatively impervious.