the lights are on, but nobody is (at|) home
1
used to refer to someone who is not paying attention or is not intelligent enough
The exact origin of the idiom "the lights are on, but nobody is home" is unclear. It has been in use for quite some time, and its origins are likely rooted in the concept of a house or building with illuminated lights but no signs of activity or inhabitants. The phrase is a figurative expression, drawing a comparison between physical presence and mental absence. It has become a common idiomatic expression in the English language to express the notion of someone being mentally absent or disconnected despite physically being present. It conveys a sense of someone being inattentive or unresponsive, as if their mind is elsewhere or not actively engaged.
- During the meeting, he just sat there with a blank expression, as if the lights were on, but nobody was home.It was clear he wasn't paying attention.
- I tried discussing the issue with him, but it felt like the lights were on, but nobody was home.He wasn't really listening or responding.
- She seems distracted all the time, like the lights are on, but nobody is at home.It's hard to have a meaningful conversation with her.