There were watchtowers all over the island, making sure that nobody could approach unseen by sea.

The sound approached unseen and stopped behind the door.

Bolan took the speedboat directly into the rear of the ship, the only angle he might approach unseen.

Thanks to the high, thick walls and the watch-towers with their distinctive rounded roofs, the residents could be sure that no one would approach unseen.

Elray had approached unseen, his boots silent on the soft dirt.

When Jerome questioned her, she replied shortly, "This way we can approach unseen."

In daylight there was too much danger of a stray hunter hearing and approaching unseen.

Lights are rigged around the ship so that swimmers and small boats cannot approach at night unseen.

There was no way that the enemy could approach unseen.

It was the only way I could approach unseen.