Demented

//dɪˈmɛntɪd// adj, verb, slang

adj, verb, slang ·Common ·High school level

Definitions

Verb
  1. 1
    simple past and past participle of dement form-of, participle, past
Adjective
  1. 1
    Insane; mentally ill.

    "So while Ralph generally seems to inhabit a different, more glorious and joyful universe than everyone else here his yearning and heartbreak are eminently relateable. Ralph sometimes appears to be a magically demented sprite who has assumed the form of a boy, but he’s never been more poignantly, nakedly, movingly human than he is here."

  2. 2
    Having dementia.
  3. 3
    Crazy; ridiculous. informal

    "a demented idea"

Adjective
  1. 1
    affected with madness or insanity wordnet

Synonyms

All synonyms
brainsickabnormalbakedbananasbarkingbarking mad

Example

More examples

"I'm in difficulties because of the demented old woman next door wreaking havoc in my fields."

Etymology

Past participle of dement + -ed, from Latin dēmentāre.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.