Vacuous (5)

I think it could be either:

inane

empty

'vacuous' is the definition.
(synonyms)

This is all the clue.

(Other definitions for inane that I've seen before include "Fatuous, vacuous" , "Lacking sense, silly" , "Fatuous, asinine" , "Moronic" , "Thick" .)

I've seen this clue in The New York Times, The Telegraph and The Mirror.

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