Ask a young adult what the word means and the response is likely to be a blank look.
When her words met with further blank looks, she continued.
She gave him a blank look, then hot color washed into her white face.
I gave him a blank look and backed away a little.
The blank looks on their faces made it clear they didn't.
The blank look was back on the kid's baby face.
It was the same blank look as on the guard's face.
He turned left and right, staring at each person in turn, getting back only blank looks.
She gave me a blank look and said, "What are you doing here?"
The young boy had a blank look on his face as he stared at the test.