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demented

[ dih-men-tid ]
/ dɪˈmɛn tɪd /
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adjective
crazy; insane; mad.
affected with dementia.
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Origin of demented

First recorded in 1635–45; dement + -ed2

OTHER WORDS FROM demented

de·ment·ed·ly, adverbde·ment·ed·ness, nounhalf-de·ment·ed, adjectivesem·i·de·ment·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use demented in a sentence

British Dictionary definitions for demented

demented
/ (dɪˈmɛntɪd) /

adjective
mad; insane

Derived forms of demented

dementedly, adverbdementedness, noun
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

Medical 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.
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