Ushiba looked around as if he might be secretly observed.

David is then killed by Loki, who was secretly observing the fight.

When secretly observed in public restrooms, only 67 percent washed their hands.

He didn't want to interrupt his own lazy pleasure in secretly observing her, by talking.

The reason doors were to be left open so as to determine whether they secretly observed any Islamic festivals.

I was the one having them secretly observed.

Scott moved behind a jutting bulkhead and took a moment to secretly observe the man in question.

It worried her that he'd been secretly observing her.

With amusement, I secretly observe my daughter cutting a hole in her designer jeans as a gesture of protest.

But by secretly observing several groups of medical students, the two doctors made a breakthrough: adults touch both their noses and eyes once every three hours.