Lacking in common sense (6)

I believe the answer is:

stupid

'lacking in common sense' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for stupid that I've seen before include "Obtuse" , "Idiot" , "bovine" , "Crass" , "moronic" .)

I've seen this clue in The Irish Times.

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