It would have been useless to simply attempt to run away because the robots were capable of unbelievable speed.

Up, down, left, right, the darting machine ahead was twisting with unbelievable speed.

He leaped away with unbelievable speed and then seemed to fly back at my head.

Everyone she knew must be whirling at an unbelievable speed.

Nile had either anticipated what he was about to do or twisted away with unbelievable speed.

His head seemed to be spinning at an unbelievable speed.

His legs can move at an unbelievable speed, making him look as if he is teleporting.

He didn't pause an instant but charged immediately at unbelievable speed.

He took a fierce swing at the pitch, the ball moving to right with almost unbelievable speed.

He was striking left and right with unbelievable speed.