impenetrable

He looked once more at her eyes and saw they were impenetrable.

For the second time this impenetrable woman called me back.

At the same time, he has built an impenetrable fire wall against his past.

And the film, while very different from the book, is every bit as impenetrable in its own way.

It's not about building up an impenetrable wall but instead just getting by with what you have.

Safety was just the other side of an impenetrable wall.

She said the door policy would be tight but not impenetrable.

Behind that firm, impenetrable face he might have been thinking anything.

He looked at her without speaking for a moment, his eyes impenetrable.

When he looked up, his face was set in an impenetrable expression.

What could be more simple than an apparently impenetrable wall?

Tell me, brother, the bush above the beach seems impenetrable.

But he had always met me with his impenetrable calm.

"In fact, looking this over, it would seem that their security for the next few months at least will be impenetrable."

How much more impenetrable the darkness must be for you.

The darkness was like a wall itself, hard and impenetrable.

Anything could be happening behind that impenetrable field of energy.

The air seemed better, though the darkness was just as impenetrable.

They claimed to be impenetrable, which is half the reason why everyone wants to get in.

And here a face moved from the impenetrable darkness into the light.

His face had lost its impenetrable look; he sat still, thinking for a minute.

"It presented a large impenetrable back, and went on thinking about something else."

It was as if she'd built a very firm, impenetrable wall between them.

Those who knew this artist very well, found him to be impenetrable, at times.

Where his father's name should have been, there was only a thin, impenetrable line.