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"vacuous" is also used as a crossword clue. If that's what you saw, the answer is often inane (5 letters).
Definitions
Empty, thoughtless, or lacking serious meaning or intelligence.
Word origin
Learned borrowing from Latin vacuus (“empty, vacant”) + -ous.
Used in a sentence
“vacuous expression”
“vacuous remark”
“The movie was criticized for its vacuous dialogue.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Lacking real thought”7 letters
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