Meaning of “madness” in the English Dictionary

"madness" in American English

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madnessnoun [ U ]

us /ˈmæd·nəs/

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)