Stupid or foolish (9)

I believe the answer is:

brainless

This clue is a double definition.

'stupid' is the first definition.
(synonyms)

'foolish' is the second definition.
(synonyms)

(Other definitions for brainless that I've seen before include "dim" , "Stupid, foolish" , "Silly" , "Devoid of intelligence" .)

I've seen this clue in The Mirror.

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