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
1.

불은 켜져 있는데 아무도 집에 없다, 멍청하다, 정신이 없다

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

:
He just stared blankly when I asked him a question, like the lights are on but nobody’s home.
내가 질문했을 때 그는 멍하니 쳐다보기만 했다. 마치 불은 켜져 있는데 아무도 집에 없는 것 같았다.
Sometimes I worry about my brother; he can be a bit slow, you know, the lights are on but nobody’s home.
가끔 동생이 걱정돼. 좀 느려, 알잖아, 불은 켜져 있는데 아무도 집에 없는 것 같아.