unexpected

The intelligence with which Lestrade greeted us was so momentous and so unexpected, that we were all three fairly dumfoundered.

The attack may not have been entirely unexpected.

“Oh, sire,” replied the minister, “we have no occasion to invent any; every day our desks are loaded with most circumstantial denunciations, coming from hosts of people who hope for some return for services which they seek to render, but cannot; they trust to fortune, and rely upon some unexpected event in some way to justify their predictions.”

“You are going to leave us?” cried Renée, unable to hide her emotion at this unexpected announcement.