Hijacking the truck between stops, as one would hijack a truckload of furs, was out of the question, for it was impregnable when closed up.
French forces reached as far as San Roque, just north of Gibraltar, but did not attempt to target Gibraltar itself as they believed that it was impregnable.
Its strength in its home market is impregnable, but its desire for international expansion remains low.
Both have self-esteem that is impregnable because it derives not from what they are accomplishing but from who they ineffably are.
"Art is impregnable in what it claims, / Consoles itself while children curl in flames.
A possible effect of all the popularizing is that it might improve DVD packaging, which is impregnable beyond the point of annoyance.
As best I understand it, the argument is that neither castle is impregnable by itself.
It just goes to show that in the modern economy, no fortress is impregnable, not even Singapore's port.
"Bell Canada is impregnable".
