The ghost story had me scared 'witless'. [=I was very scared]
We were bored 'witless'. [=we were extremely bored]
He committed a 'witless' blunder.
(..) and you will never see her again. You will spend the rest of your days in the dungeons. And what of Thor? You'll make that witless oaf king while I rot in chains. Thor must strive to undo the damage you have done. He will bring order to the Nine Realms (..)2013 Thor: The Dark World