Perhaps the most unpredictable threat of all, and the one cited most often these days, is North Korea.

Live with a new, unpredictable threat orbiting right above us?

The most unpredictable threat you face has to be the aliens aboard your own ship.

Rerden was later quoted in the media as saying that the rebels were killed "because they were armed and posed an unpredictable threat."

Opera companies must always contend with the unpredictable threat of cancellations.

Many look to streamline the system to more nimbly counter the unpredictable terrorist threat.

We face an ever-growing array of unpredictable and asymmetrical threats.

Charlotte out at once, giving her no chance to rest and so making her more of an unpredictable threat to him.

But now, the missile attacks have become just one more danger among the lethal, unpredictable threats that Israelis face almost every day.

We must judge our security not by our ability to deal with what we know, but how able we are to respond to unpredictable threats.