1. an event that is disappointing because it is much less significant or exciting than expected
2. something that fails to happen or occur as anticipated

Examples

• The concert turned out to be a complete nonevent with poor sound and a lackluster performance.
• After all the hype, the product launch was a nonevent that barely attracted any media attention.
• The predicted storm was a nonevent, with only light rain falling.
• The merger talks ended up being a nonevent when negotiations fell through.
• What was supposed to be the party of the year became a nonevent when only five people showed up.
• The eclipse viewing was a nonevent due to heavy cloud cover.
• The grand opening was such a nonevent that most people didn’t even notice the store had opened.