For a moment it seemed almost impossible, even with the advantage of surprise.

Most, however, are impossible with current technology and physical laws.

It was impossible to reason with anyone who regarded education as a waste of time.

"But it's impossible not to be a favorite with the kind of talent we have."

It was almost impossible with her belly in the way.

A search of his own would be impossible, with patrol cars all about.

"The project is not impossible with the help of a person such as yourself."

Terminology, always difficult, had become impossible with the going to the stars.

But it would be impossible with all three men in the boat.

But that, he knew, would be impossible with the two guards watching.