adverb taking the 'to' particle
blankly; vacantly; dazedly; in puzzlement
Describes a facial expression or state of being momentarily stunned, confused, or at a loss, often with a blank stare. Typically used with する or とした.
At the sudden question, he looked blankly puzzled.
The cat was staring vacantly at the loud noise.
When his name was suddenly called, he looked blank with surprise.
The child looked up at me with a blank, puzzled expression.
The question left her looking blank and confused.