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Synonyms
de·ment·ed (dĭ-mĕńtĭd)

adjective 

  1. Mentally ill; insane.
  2. Suffering from dementia or a loss of cognitive function.

derivatives

de·ment́ed·ly
adverb
de·ment́ed·ness
noun
de·ment (dĭ-mĕnt́)

[Late Latin dēmentāre, from Latin dēmēns, dēment-, senseless, dē-, de-, + mēns, mind.]

transitive verb: -ment·ed, -ment·ing, -ments. 

  1. To make (a person) insane.
  2. To cause (a person) to lose intellectual capacity.