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vacuous (adj) stupid; senseless.
A vacuous remark is a stupid or foolish remark. A vacuous book is a stupid book, showing that the author is unintelligent. A vacuous movie is a movie that is no good at all, as it is not imaginative or intelligent.
- I found the romantic novel absolutely vacuous. It is the most unimaginative and senseless novel I have ever read.
- Almost the whole of his speech was vacuous. It was senseless and stupid and the audiences were very disappointed.