Also found in: Thesaurus, Medical, Encyclopedia.


1. Suffering from dementia.
2. Informal Crazy or foolish.

de·ment′ed·ly adv.
de·ment′ed·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dementedness - mental deterioration of organic or functional origin
insanity - relatively permanent disorder of the mind
alcohol amnestic disorder, alcoholic dementia, Korsakoff's psychosis, Korsakoff's syndrome, Korsakov's psychosis, Korsakov's syndrome, polyneuritic psychosis - dementia observed during the last stages of severe chronic alcoholism; involves loss of memory for recent events although long term memory is intact
presenile dementia - dementia with onset before the age of 65
senile dementia, senile psychosis - dementia of the aged; results from degeneration of the brain in the absence of cerebrovascular disease
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
[7] The rapidity of dementedness can increase exponentially by aggregate age, and this aging technique in animals is related to a deliberate deterioration of sensory and
Since Zoraide disobeys the mistress's order and "sins" with her lover, her mistress not only induces that planter to sell her lover to a faraway place but also deprives Zoraide of her baby, resulting in her lifelong dementedness. Peggy Skaggs sees the narrative as an illustration of "one of Chopin's best themes: that tragedy results when a person is robbed of her right to be her own person and to love whom she will" (20) and Per Seyersted reads the narrative as "more a plea for woman's right to choose her husband than a direct condemnation of slavery" (93).
The cheer that welcomed one of the bankers of the week started as he surged to the front three out, and grew in dementedness until Monsignor and jockey Norman Williamson drowned in a roar of Istabraq proportions on entering the winner's enclosure.