/ Dictionary / Index V vacuous: Meaning and Definition of Find definitions for: vac•u•ous Pronunciation: (vak'y-us), [key] — adj. without contents; empty: the vacuous air. lacking in ideas or intelligence: a vacuous mind. expressing or characterized by a lack of ideas or intelligence; inane; stupid: a vacuous book. purposeless; idle: a vacuous way of life. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: vacuous (Thesaurus) vacuole vacuum Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language