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Adjective: vacuous  va-kyoo-us
  1. Devoid of intelligence or thought
    "a vacuous mind";
    - mindless, vacant
     
  2. Devoid of significance or force
    "vacuous comments";
    - empty, hollow
     
  3. Devoid of matter
    "a vacuous space"

See also: daft [Brit, informal], dumb, empty, foolish, imbecile, imbecilic, meaningless, nonmeaningful, stupid

Encyclopedia: Vacuous

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vacillation
vacillator
Vaclav Havel
vacuity
vacuolate
vacuolated
vacuolation
vacuole
vacuolisation
vacuolization
vacuous
vacuously
vacuousness
vacuum
vacuum aspiration
vacuum bag
vacuum bomb
vacuum bottle
vacuum chamber
vacuum cleaner
vacuum flask