He evidently did not know that he was seen, but was watching the ladies, thinking that he himself was unobserved.

I knew where the post-office was, and slipped out in the morning unobserved and dropped my letter in the box.

There he would sit and listen at times, unobserved, to the quite remarkable conversation of some young fellows.

The two men who were sitting there, and by whom I was as yet unobserved, were Delora and the Chinese ambassador!