Andrea took the pen with an imperceptible smile and began.

His almost imperceptible smile was that of a psychopath.

A second smile, almost imperceptible, stole over the rosy lips of the pretty young woman.

'Hello, Brian,' she says, and gives an imperceptible smile, because after all, we have a secret.

As we rounded a turn, I could see the appearance of an almost imperceptible smile on his lips.

That almost imperceptible smile flickered at the corners of her mouth.

An almost imperceptible smile creased his lips as he spoke into the phone.

A thin, almost imperceptible smile appeared as Cranston's lips voiced words that decided the issue.

She threw a quick, searching glance around the room, and an imperceptible smile passed over her beautiful pale face.

Therefore he looked at her with an imperceptible smile, and said with deep interest: "But how could this happen, my lady?