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Adjective: demented  di'men-tid
  1. Affected with madness or insanity
    "a man who had gone demented";
    - brainsick, crazy, disturbed, mad, sick, unbalanced, unhinged
Verb: dement  di'ment
  1. To deprive of reason; to make mad

See also: insane

Encyclopedia: Demented

Dement, John