vacuous

Reserved for the harmlessly stupid and truly meaningless, vacuous is a smart-sounding way to describe something dumb. Celebrity gossip and reality TV are usually pretty vacuous, even if they're fun.

If someone smiles at you in a way that seems fake or empty, you could describe the smile as vacuous. An example of a vacuous comment would be a politician promising to make things better without explaining how. If something is vacuous, it's like a vacuum — hollow, empty, devoid of substance.

Definitions of vacuous
1

adj devoid of matter

“a vacuous space”
Synonyms:
empty
holding or containing nothing

adj void of expression

Synonyms:
blank
incommunicative, uncommunicative
not inclined to talk or give information or express opinions

adj devoid of significance or point

vacuous comments”
Synonyms:
empty, hollow
meaningless, nonmeaningful
having no meaning or direction or purpose

adj devoid of intelligence

Synonyms:
asinine, fatuous, inane, mindless
foolish
devoid of good sense or judgment

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