Topic: PSYCHOLOGY, PSYCHIATRY
| Date: | 1700-1800 |
| Origin: | derange 'to make untidy, make mad' (18-21 centuries), from French déranger |
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de‧ranged

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