意外的的英语短语怎么说

"Unexpected" is the Engpsh word for "意外的". So you could say "an unexpected event" or "something unexpected happened".

Other phrases that might be helpful include:

"out of the blue" - something that happens unexpectedly and without warning
"taken aback" - surprised or shocked by something unexpected
"unforeseen circumstances" - events or situations that were not anticipated or predicted
"unanticipated" - not expected or predicted

For example:

"I was taken aback when I received the news of his sudden death. It was completely unexpected."
"Due to unforeseen circumstances, we have had to reschedule the meeting for next week."
"We had an unanticipated issue with the project, but we were able to find a solution."