Mind-numbing

It was mind-numbing.

The work is mind-numbing.

This kind of work is mind-numbing, but essential if we want the project to be a success.

Some people find "mind-numbing" work to be anything but that.

After hours of mind-numbing work sorting hundreds of nearly identical form, he needed to stop and do something else.

The story described the main character's wristwatch in mind-numbing detail.