His keen mind had long since accepted the fact that divorce was the only possible way out.

Above all he had a keen mind like a rapier.

His keen mind was finding another explanation - one that meant murder!

His keen mind had seen the purpose of this terrible machine.

You have such a keen mind, such a strong energy.

To his keen mind came the answers that gave away the game of crime.

The way his dark eyes moved betrayed a keen mind.

Though the human didn't say anything, Al knew the keen mind was absorbing everything he said.

His keen mind was working on these same problems.

"It takes a very keen mind to see through some of this deception," he said.