vac·u·ous

[vak-yoo-uhs]
adjective
1.
without contents; empty: the vacuous air.
2.
lacking in ideas or intelligence: a vacuous mind.
3.
expressing or characterized by a lack of ideas or intelligence; inane; stupid: a vacuous book.
4.
purposeless; idle: a vacuous way of life.

Origin:
1645–55; < Latin vacuus empty; see -ous

vac·u·ous·ly, adverb
vac·u·ous·ness, noun
non·vac·u·ous, adjective
non·vac·u·ous·ly, adverb
non·vac·u·ous·ness, noun
un·vac·u·ous, adjective
un·vac·u·ous·ly, adverb
un·vac·u·ous·ness, noun

vacant, vacuous, vapid.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Vacuous is always a great word to know.
So is slumgullion. Does it mean:
a gadget; dingus; thingumbob.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
vacuous (ˈvækjʊəs) [Click for IPA pronunciation guide]
 
adj
1.  containing nothing; empty
2.  bereft of ideas or intelligence; mindless
3.  characterized by or resulting from vacancy of mind: a vacuous gaze
4.  indulging in no useful mental or physical activity; idle
5.  logic, maths (of an operator or expression) having no import; idle: in (x) (John is tall) the quantifier (x) is vacuous
 
[C17: from Latin vacuus empty, from vacāre to be empty]
 
'vacuously
 
adv
 
'vacuousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

vacuous
1648, "empty," from L. vacuus "empty, void, free" (see vacuum). Figurative sense of "empty of ideas" is from 1848.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And despite this somewhat overly simple and circular criterion, it is not vacuous.
Then it becomes emptiness, transforming people into vacuous ghosts of who they used to be.
It's an overly simple and circular criterion, but it isn't vacuous.
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