Synonyms of 'vacuous'
1 vapidDictionary, stupid, inane
the usual vacuous comments from the chat-show host
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He gave him a blank look.
She saw the empty look in his eyes as he left.
If you describe someone's behaviour or actions as inane, you think they are very silly or stupid.
He always had this inane grin.
Thesaurus for vacuous from the Collins English Thesaurus
If you describe a person or their comments as vacuous , you are critical of them because they lack intelligent thought or ideas.