The lights are on but nobody’s home

Pro Tip 1/3

Non-literal Meaning

This idiom isn't about actual lights or homes; it describes a person's absent response or lack of understanding.

He never laughs at jokes; it's like the lights are on but nobody's home.

Pro Tip 2/3

Slightly Offensive

Use careful judgment as the phrase may come off as rude or insensitive when describing someone's intellect.

I hesitated to say 'the lights are on but nobody's home' since it could be taken the wrong way.

Pro Tip 3/3

Informal Context

Best used in casual conversations and is considered informal, so avoid using in formal writing or speaking.

In the staff meeting, I won't say 'the lights are on but nobody's home' to describe the manager's idea.