Longman Dictionary of Contemporary English homepage

insanity

 noun
     
Related topics: Illness and Disability, Psychology, Psychiatry, Law
in‧san‧i‧ty [uncountable]
1SCLMI the state of being seriously mentally ill, so that you cannot live normally in society [= madness]:
The court acquitted Campbell on the grounds of temporary insanity.
2 very stupid actions that may cause you serious harm [= lunacy]:
Can't they see the insanity of dumping radioactive waste in the sea?
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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