demented

[ dih-men-tid ]
/ dɪˈmɛn tɪd /

adjective

crazy; insane; mad.
affected with dementia.

Origin of demented

First recorded in 1635–45; dement + -ed2

Related forms

de·ment·ed·ly, adverbde·ment·ed·ness, nounhalf-de·ment·ed, adjectivesem·i·de·ment·ed, adjective

Definition for demented (2 of 2)

dement

[ dih-ment ]
/ dɪˈmɛnt /

verb (used with object) Obsolete.

to make mad or insane.

Origin of dement

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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for demented

British Dictionary definitions for demented (1 of 2)

demented

/ (dɪˈmɛntɪd) /

adjective

mad; insane

Derived Forms

dementedly, adverbdementedness, noun

British Dictionary definitions for demented (2 of 2)

dement

/ (dɪˈmɛnt) /

verb

(intr) to deteriorate mentally, esp because of old age
(tr) rare to drive mad; make insane

Word Origin for dement

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

Medicine definitions for demented

demented

[ dĭ-mĕntĭd ]

adj.

Mentally ill; insane.
Suffering from dementia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.