the lights are on but nobody’s home
idiomPart oflight
the lights are on but nobody’s home — idiom
1. Used to describe someone who is not paying attention or is not very smart.
1.idiom
Definition
Used to describe someone who is not paying attention or is not very smart.
Example
He stared blankly; the lights are on but nobody's home.
When she didn't answer, I thought the lights are on but nobody's home.