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demented

[dih-men-tid] /dɪˈmɛn tɪd/
adjective
1.
crazy; insane; mad.
2.
affected with dementia.
Origin of demented
1635-1645
First recorded in 1635-45; dement + -ed2
Related forms
dementedly, adverb
dementedness, noun
half-demented, adjective
semidemented, adjective
Synonyms
1. lunatic, crazed, deranged, unbalanced.

dement

[dih-ment] /dɪˈmɛnt/
verb (used with object), Obsolete.
1.
to make mad or insane.
Origin
1535-45; < Late Latin dēmentāre to deprive of mind, equivalent to Latin dēment- (stem of dēmēns) out of one's mind (dē- de- + ment- (stem of mēns) mind) + -āre infinitive suffix
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for demented
Contemporary Examples
Historical Examples
  • "The poor creature's demented," remarked Mrs. Belknap-Jackson pityingly.

    Ruggles of Red Gap Harry Leon Wilson
  • She appeared to be demented, and sang snatches of savage songs.

    Chronicles of Border Warfare Alexander Scott Withers
  • But at that moment the young lady rose and ran as if demented into her castle.

    The Burning Spear John Galsworthy
  • They flashed up and down the brook like a pair of demented fireworks.

    "Wee Tim'rous Beasties" Douglas English
  • Ah, I see you think I am demented because I say that, but my husband is alive.

    Mary Louise and Josie O'Gorman

    Emma Speed Sampson
British Dictionary definitions for demented

demented

/dɪˈmɛntɪd/
adjective
1.
mad; insane
Derived Forms
dementedly, adverb
dementedness, noun

dement

/dɪˈmɛnt/
verb
1.
(intransitive) to deteriorate mentally, esp because of old age
2.
(transitive) (rare) to drive mad; make insane
Word Origin
C16: from Late Latin dēmentāre to drive mad, from Latin de- + mēns mind
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for demented
adj.

1640s, from obsolete dement "drive mad."

dement

v.

1540s, "to drive mad," probably from Middle French démenter, from Late Latin dementare "to drive out of one's mind," from phrase de mente (a less technical term than insanitas), from de + mente, ablative of mens mind" (see mind (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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demented in Medicine

demented de·ment·ed (dĭ-měn'tĭd)
adj.

  1. Mentally ill; insane.

  2. Suffering from dementia.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Word Value for demented

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