He came back unannounced two weeks later and found the paper still there.

"It was quite rude of us to come unannounced," the young woman replied.

You never know who might appear - Green Day came unannounced in 2009.

At this most difficult moment of lonely despair, she came to see him and walked into his study unannounced.

"Aside from the fact that the lad came unannounced, what do you think of him?"

But he wouldn't have come unannounced like this on a social call.

The plague comes unannounced and may strike down anyone at any time.

He had come unannounced, directly from a meeting with his ministers.

He had no phone then - didn't want people bothering him - so we came unannounced.

But it was your father, who had come unannounced.