from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Devoid of matter; empty.
- adj. Lacking intelligence; stupid.
- adj. Devoid of substance or meaning; inane: a vacuous comment.
- adj. Devoid of expression; vacant: "The narrow, swinelike eyes were open, no more vacuous in death than they had been in life” ( Nicholas Proffitt).
- adj. Lacking serious purpose or occupation; idle. See Synonyms at empty.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Lacking meaningful content.
- adj. Showing a lack of thought or intelligence; vacant
from the GNU version of the Collaborative International Dictionary of English
- adj. Empty; unfilled; void; vacant.
from The Century Dictionary and Cyclopedia
- Empty; unfilled; void; vacant.
- Without intelligence or intelligent expression; unexpressive; showing no intelligence: as, a vacuous look.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. devoid of intelligence
- adj. devoid of matter
- adj. devoid of significance or point
- adj. void of expression
From Latin vacuus, empty; see vacuum.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin vacuus ("empty, vacant") (Wiktionary)