Definition of vacuous adjective from the Oxford Advanced American Dictionary

 

vacuous

 adjective
adjective
NAmE//ˈvækyuəs//
 
(formal)
 
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showing no sign of intelligence or sensitive feelings a vacuous expression
 
adverb He stared down at her, grinning vacuously.
vacuousness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: vacuous