Vacuous (5)
'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" .)
'vacuous' is the definition.
(I know that vacuous can be written as empty)
This is all the clue.
(Other definitions for empty that I've seen before include "worthless" , "Evacuate" , "Void; vacant" , "vain" , "Drained glass" .)