Lacking sense (5)

I think it could be either:

Which length description are you looking for?:

inane

'lacking sense' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for inane that I've seen before include "Without meaning or point" , "Stupid and silly" , "Idiotic" , "Really stupid" , "Foolish, silly" .)

I've seen this clue in The Telegraph.

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