Longman Dictionary of Contemporary English homepage

Topic: PSYCHOLOGY, PSYCHIATRY

Date: 1600-1700
Origin: dement 'to drive mad' (16-19 centuries), from Latin mens 'mind'

demented

adjective
     
de‧men‧ted
1 crazy or behaving in a very strange way:
She was almost demented with grief.
2MP old-fashioned suffering from dementia
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