Her favorite moments then had been when she'd been able to slip away unobserved and spend a few minutes on a secluded porch.

This they did during the morning, having been able, in the near-panic at Dinas Brenin, to slip away unobserved.

We set off after it was full dark, and the four of us slipped out of camp unobserved.

From there it was a simple matter to slip unobserved into the garden, then into the street beyond.

They arrived before the first servants had begun to stir, and were able to slip back into their quarters unobserved.

In the early days of peace there were many places where it was not difficult to slip unobserved from one zone to the next.

The Prison House of Death Gerard had no difficulty slipping unobserved into the city.

Sheen faded into the crowd, leaving Mellon; she would slip into a service aperture unobserved.

She managed to slip through the crowded rooms unobserved.

He took it on his arm, and slipped unobserved into the fringe of the trees.