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English definition of “madness”

madness

noun [U]  /ˈmæd·nəs/ us  
mental illness: There was a history of madness in her family. Madness can also refer to behavior that is not reasonable when considering certain situations: It would be sheer madness (= crazy) to ignore the symptoms and do nothing.
(Definition of madness from the Cambridge Academic Content Dictionary © Cambridge University Press)
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