Has Been Unforeseen Circumstances?

If something that has happened was unforeseen, it was not expected to happen or known about beforehand.

What does it mean when you say unforeseen circumstances?

used in official statements for explaining that something unexpected has happened that will prevent an event or situation from continuing normally.

What are examples of unforeseen circumstances?

Accidents are usually unforeseen events: no one expects to get in a car or bike accident on a given day. Winning the lottery, since it's so unlikely, would be an unforeseen event. If something was unanticipated or out of the blue, it was unforeseen. Unforeseen events can be good or bad, but they're all surprises.