Meaning of the word "the lights are on but nobody’s home" in English

What does "the lights are on but nobody’s home" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the lights are on but nobody’s home

US /ðə laɪts ɑr ɑn bʌt ˈnoʊbədiz hoʊm/
UK /ðə laɪts ɑr ɑn bʌt ˈnoʊbədiz hoʊm/
"the lights are on but nobody’s home" picture

Idiom

1.

used to describe someone who is not very intelligent or is not paying attention

Example:
He just stared blankly when I asked him a question, like the lights are on but nobody’s home.
Sometimes I worry about my brother; he can be a bit slow, you know, the lights are on but nobody’s home.
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