demented

[dih-men-tid]
adjective
1.
crazy; insane; mad.
2.
affected with dementia.

Origin:
1635–45; dement + -ed2

dementedly, adverb
dementedness, noun
half-demented, adjective
semidemented, adjective


1. lunatic, crazed, deranged, unbalanced.
Dictionary.com Unabridged

dement

[dih-ment]
verb (used with object) Obsolete.
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dement (dɪˈmɛnt)
 
vb
1.  (intr) to deteriorate mentally, esp because of old age
2.  rare (tr) to drive mad; make insane
 
[C16: from Late Latin dēmentāre to drive mad, from Latin de- + mēns mind]

demented (dɪˈmɛntɪd)
 
adj
mad; insane
 
de'mentedly
 
adv
 
de'mentedness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

demented
1640s, from obsolete dement "drive mad."

dement
1540s, "to drive mad," probably from M.Fr. dementer, from L.L. dementare "out of one's mind," from phrase de mente, from de + mente, ablative of mens mind" (see mind (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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FOLDOC
Computing Dictionary

demented definition


Yet another term of disgust used to describe a program. The connotation in this case is that the program works as designed, but the design is bad. Said, for example, of a program that generates large numbers of meaningless error messages, implying that it is on the brink of imminent collapse.
[Jargon File]
(1994-12-07)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
That's one reason why researchers suspect these patients become demented in the
  first place.
Another pause, and he broke out again like one demented.
Suddenly they were joined by a bigger man, also with a demented look about the
  eyes.
Now they're mostly bitter and demented.
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