Crossword Genius

Stupid not to be runny (5)

Ross

I believe the answer is:

thick

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'stupid' is the definition.
(similar in meaning)

I can't explain the rest of the clue.

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(Other definitions for thick that I've seen before include "Broad; dense" , "Stupid (as two short planks?)" , "But surely not all thieves are" , "Foolish" , "deficient in understanding" .)

I've seen this clue in The Mirror.
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