Definition of vacuous adjective from the Oxford Advanced Learner's Dictionary

 

vacuous

 adjective
adjective
BrE BrE//ˈvækjuəs//
 
; NAmE NAmE//ˈvækjuəs//
 
(formal)
 
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showing no sign of intelligence or sensitive feelings a vacuous expression Word Origin mid 17th cent. (in the sense ‘empty of matter’): from Latin vacuus ‘empty’ + -ous.
See the Oxford Advanced American Dictionary entry: vacuous