Stupid and silly (7)

I believe the answer is:

fatuous

'stupid and silly' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for fatuous that I've seen before include "Stupid and silly" , "Foolish, inane" , "Silly and pointless" , "Witless" , "Foolish or silly" .)

I've seen this clue in The Irish Times.

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