The result of not thinning out - sheer stupidity (9)
I believe the answer is:
denseness
'stupidity' is the definition.
(I know that denseness is a type of stupidity)
I can't explain the rest of the clue.
Can you help me to learn more?
(Another definition for denseness that I've seen is " Stupidity".)
I've seen this clue in the Evening Standard.
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