It becomes impenetrable.

They found the arctic ice impenetrable, and soon gave up their quest.

Why, then, do rocks look and feel solid and hard and impenetrable?

The boundaries between the two types of legalities could not remain impenetrable forever.

It lies far beyond the scope of any human mind, it remains impenetrable.

They do, he said through his muffler, eyeing her quietly through his impenetrable glasses.

It's the pathfinder that shows us a simple road through an impenetrable moral maze.

You'll be separated from Richelieu by the most impenetrable of all barriers, a war.

In these matters there are so many... conflicting opinions that the confusion is impenetrable.

In fact, the financial statements of mega banks are impenetrable works of fiction or wishful thinking.

But to an outsider, it seems to be as impenetrable as the Great Wall of China.

Her titanium alloy impenetrable skin covers the toughest, meanest, most sophisticated space vehicle man has ever made.

Such Westerners are now often just as enamored of China s paternalistic and equally opaque and impenetrable political system.

Some of the barriers are stronger, thicker and more impenetrable to trade than the Berlin Wall once was.

But, while such measures would increase the difficulty of hacking the system, no technological fix can make it impenetrable.

Rocks feel hard and impenetrable to our hands, precisely because objects like rocks and hands cannot penetrate each other.

MADRID Our brains are like a dense forest a complex, seemingly impenetrable terrain of interacting neurons that mediates cognition and behavior.

Only then will the young people feel the presence of what otherwise might be thought of as an impenetrable, inaccessible and distant bureaucracy.

The Rohingya are not recognized by Burmese law, and face official discrimination and harsh treatment, including virtually impenetrable barriers to citizenship and forced labor.

And technology pushed composers to tremendous extremes, using computers and synthesizers to create works of intellectually impenetrable complexity beyond the means of performers and audiences.

Systemic importance has become an excuse for maintaining impenetrable entry barriers (yet another reason why executives want their firms to be regarded as too big to fail).

In 2003, Ben Bernanke, then a Governor of the US Federal Reserve, stated in a speech that many Americans considered inflation targeting foreign, impenetrable, and possibly slightly subversive.

There is a poverty curtain which continues to create a great divide and which becomes more impenetrable when we wilfully shut our eyes to the concept of solidarity.

From what I understand, when the firefighters arrived at those corridors they were considered impenetrable and too dangerous to enter, it was decided the only other way to get there, was through the ceiling.

In quantum mechanics, the particle in a box model (also known as the infinite potential well or the infinite square well) describes a particle free to move in a small space surrounded by impenetrable barriers.

As a result, sovereignty is no longer as absolute and impenetrable as it once seemed. This is the reality that the UN General Assembly acknowledged when it recognized a responsibility to protect endangered people in sovereign states.

Small community enterprises are being created in communities around the Bwindi Impenetrable National Park in Uganda to generate income while conserving the park, named a World Heritage Site by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1994.