look blank

Idioms  

1. Be expressionless, appear dumbstruck or overwhelmed. For example, When I asked her how to get to the hospital, she looked blank. [c. 1700]

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Example Sentences

She said she worried about making the child look "blank or rude".

From BBC

The new Elements line accomplishes this through a wood-like veneer that allows the light to shine through when its on but doesn’t look blank when the light isn’t in use.

From The Verge

I know the technique, how to look blank and as if you are listening when really you are trying to fly away from your body.

From Literature

Avoid opening your eyes wide, which will make you look blank and thoughtless.

From New York Times

To which the Dog wud either look blank at me, as if I was not even speeking Dog, or fling themself around inside there Kar, as if they wud like to brake out and do damage to me, a Fox!

From The Guardian