unforeseen

He noted there could also be unforeseen factors that could cause prices could dip, however, as the events are still seven months away.

When it came back online, I saw my appointment had been cancelled days earlier "due to unforeseen circumstances."

All these chores, errands and responsibilities are simple to schedule on paper, but in practice, unforeseen circumstances ensure that chaos reigns.

The unpredictable work hours, due to unforeseen delays and accidents, was one of the toughest challenges of the job.

So what if an unforeseen hurdle appeared in front of their October path?