Mindless, vacuous (7)

I believe the answer is:

asinine

This clue is a double definition.

'mindless' is the first definition.
(synonyms)

'vacuous' is the second definition.
(synonyms)

(Other definitions for asinine that I've seen before include "Silly like a donkey" , "Idiotic" , "Absurd" , "Really silly, ridiculous" , "Jenny's often like this" .)

I've seen this clue in The Irish Times.

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