Vacuous (5)

I think it could be either:

inane

empty

'vacuous' is the definition.
(synonyms)

This is all the clue.

(Other definitions for inane that I've seen before include "Fatuous, vacuous" , "Lacking sense, silly" , "Fatuous, asinine" , "Moronic" , "Thick" .)

I've seen this clue in The Mirror, The New York Times and The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.