Crossword Genius

Very foolish (7)

Ross

I think it could be either:

idiotic

asinine

'very foolish' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for idiotic that I've seen before include "Absurd, crackbrained" , "description of Dostoevsky hero?" , "Fatuous" , "Silly" , "Witless" .)

I've seen this clue in The Times and The Independent.
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