- crazy; insane; mad.
- affected with dementia.
Origin of demented
SynonymsSee more synonyms on Thesaurus.com
- to make mad or insane.
Origin of dement
Examples from the Web for demented
Did playing such a demented character like Dexter for so long mess with your head?Michael C. Hall on Going Drag for ‘Hedwig and the Angry Inch’ and Exorcising ‘Dexter’
December 4, 2014
It was unpleasant and discombobulating: a simulation of hostage-taking, mental asylum and demented dreamscape all rolled into one.Sex, Blood, and Screaming: Blackout’s Dark Frights
October 7, 2014
I warmed to him immediately—it was impossible not to—unless you are a demented ideologue who has lost normal human reactions.The James Foley I Knew in the ISIS War Zone
August 20, 2014
The simple answer, as the demented circus of Twitter and the Internet demonstrate every day, is: durr, no.Atheist King Richard Dawkins’ Rape Fantasy
July 31, 2014
She is the mother from hell; a demented cross between Cersei and Tywin Lannister.Inside ‘Orange Is the New Black’ S2, Eps. 6-12: About That Shocking Incest Scene
Kevin Fallon, Marlow Stern
June 20, 2014
"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
They flashed up and down the brook like a pair of demented fireworks."Wee Tim'rous Beasties"
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
- mad; insane
- (intr) to deteriorate mentally, esp because of old age
- (tr) rare to drive mad; make insane
Word Origin and History for demented
1640s, from obsolete dement "drive mad."
- Mentally ill; insane.
- Suffering from dementia.