She felt herself blushing, saw the almost imperceptible motion of the waiter's head as he tuned his ears in.

Intent upon the message, Knight failed to see an almost imperceptible motion that was taking place close by.

Neither man noticed an almost imperceptible motion of a window shade at the side of the room.

Although an almost imperceptible motion, it was enough to spoil the telescope's fine pointing mechanisms and would have spoiled any observations of stars.

NO one noticed an imperceptible motion of one window shade.

Neither saw the imperceptible motion of the barrier.

This seemed probable from the almost equally imperceptible motion of her shapely shoulders.

Many of these "imperceptible motions" are only perceivable with the help of special tools and careful observation.

The New Yorker had drawn his guns with an almost imperceptible motion.

The early morning breakfasters, like the people in the street, were all dead in this new way, moving with almost imperceptible motion.