be scared/bored witless
be bored witless
To be extremely bored. My flight's been delayed, and I'm bored witless after sitting around the airport all day.
be scared witless
To be very severely frightened or worried. I was scared witless when I thought I heard footsteps on the staircase when no one else was home. We were scared witless when we woke up to the sound of the howler monkeys. We had no idea what it was coming from. I'm scared witless that the tests are going to come back positive.