She smiled a smile hardly perceptible, as though it was for herself alone.

If the nation is on a new course, it is hardly perceptible.

Small crowded tables, lights so dim the faces were hardly perceptible.

Though the difference in elevation is hardly perceptible, the new settlement's name was also of local coinage.

They moved in small circles, hardly perceptible at first, but moving.

She had an odd colour and her breathing was hardly perceptible.

The lines of growth are hardly perceptible, except on the base.

As he went forward, a green glow formed around him, at first hardly perceptible.

Hardly perceptible at first, it was soon oscillating in a regular rhythm.

The shock of it on board of her was hardly perceptible.