Use the word "uneventful" to explain that nothing interesting happened for a certain period. Use it like this:
A: Did anything interesting happen?
B: Not really. It was pretty uneventful.
Although it means that nothing interesting happened, "uneventful" doesn't sound negative. It sounds neutral or even a little positive.
You can use "uneventful" to talk about things like:
- your work day
- a sports match
- a trip