Blank, expressionless (7)

I believe the answer is:

vacuous

This clue is a double definition.

'blank' is the first definition.
(thesaurus)

'expressionless' is the second definition.
(I've seen this before)

(Other definitions for vacuous that I've seen before include "Empty-headed" , "Expressionless" , "Hollow" , "Lacking intelligent ideas" , "Devoid of significance or point" .)

I've seen this clue in The Guardian.

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