Longman Dictionary of Contemporary English homepage

Topic: PSYCHOLOGY, PSYCHIATRY

Date: 1700-1800
Origin: derange 'to make untidy, make mad' (18-21 centuries), from French déranger

deranged

adjective
     
de‧ranged
MP someone who is deranged behaves in a crazy or dangerous way, usually because they are mentally ill:
a deranged gunman
derangement noun [uncountable and countable]
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