Suprisingly.
surprisingly
abruptly, unexpectedly
Encountering or meeting unexpectedly
strangely, bizarrely uniquely, unexpectedly, uniquely, coincidentally, sometimes ironically, unexpectedly
The root word for unexpectedly is "expect."
He had arrived unexpectedly and they were delighted to see him.
Surprise would be the world. It is unexpectedly sudden.
He had no illness, so Harvey's death came unexpectedly. Unexpectedly, the couch exploded. It was an unexpectedly brief encounter. Unexpectedly, the monkey counted the beans correctly.
I was very happy when my brother came to visit unexpectedly this weekend.
He took a week off when his mother died unexpectedly last year.
Surprisingly, unexpectedly, instantly.
unexpectedly