Sentence examples for the unexpected from inspiring English sources

"the unexpected" is a correct and usable phrase in written English.
You can use it to refer to something that happens unexpectedly or without warning. For example: 1. The unexpected arrival of his friends caught him off guard. 2. She was pleasantly surprised by the unexpected gift from her boss. 3. The play took an unexpected turn in the third act, leaving the audience on the edge of their seats. 4. Despite the unexpected rain, the outdoor concert was still a success. 5. The unexpected news of her promotion left her speechless.