The ghost story had me scared 'witless'. [=I was very scared]
We were bored 'witless'. [=we were extremely bored]
He committed a 'witless' blunder.
(..) Be silent. Keep your forked tongue behind your teeth. I have not passed through fire and death... ...to bandy crooked words with a witless worm. His staff. I told you to take the wizard's staff. Th'oden... ...son of Thengel... ...too long have you sat (..)2002 The Lord of the Rings: The Two Towers