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demented

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

Origin of demented

First recorded in 1635–45; dement + -ed2
Related formsde·ment·ed·ly, adverbde·ment·ed·ness, nounhalf-de·ment·ed, adjectivesem·i·de·ment·ed, adjective

Synonyms

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1. lunatic, crazed, deranged, unbalanced.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for dementedly

demented

adjective
  1. mad; insane
Derived Formsdementedly, 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

Word Origin and History for dementedly

demented

adj.

1640s, from obsolete dement "drive mad."

Online Etymology Dictionary, © 2010 Douglas Harper

dementedly in Medicine

demented

(dĭ-mĕntĭd)
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.