Many observers suspected a deal from the outset, but it was only decades later that the full story emerged; the Americans had the necessary deniability.

Their commands would be by mail, or evocations that a sharp observer might suspect.

An observer may suspect that there is some "key" that unlocks the message.

An observer flying at low altitude would never have suspected the importance of this plant.

The best concealment is that which the observer never suspects.

At first, some observers suspected that this might be an illusion.

A cynical observer might suspect him of masking power politics with religious rhetoric.

An observer might have suspected that she took more time than was necessary.

Some observers suspect that the main reason is women do not want to pay $22 for depressing news.