Crossword Genius

A brilliant rebuttal (4)

Ross

I believe the answer is:

dull

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for dull that I've seen before include "Boring - not sunny" , "Lusterless or uninteresting" , "Lacking excitement" , "mat" , "Monotonous" .)

I've seen this clue in the Evening Standard.
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