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vacuous

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vacuous/ˈvækjəwəs/adjective
vacuous
/ˈvækjəwəs/
adjective
Learner's definition of VACUOUS  
[more vacuous; most vacuous]formal
: having or showing a lack of intelligence or serious thought : lacking meaning, importance, or substance

— vacuously

adverb

— vacuousness

noun,[noncount]
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