How to express elegance after a wasted trip?

The elegant expression is "take a trip without substantial gains"

This expression emphasizes that the result of the trip did not reach the expected goal, and also emphasizes the unnecessary and waste of the trip. At the same time, this expression also avoids the use of derogatory terms and is more elegant and polite. In communication, you can use this expression to convey your point of view and avoid bringing unnecessary conflict or uncomfortable feeling to the other party.