/ ˈmædnəs; NAmE / noun [ U ]
1.
( old-fashioned ) the state of having a serious mental illness
SYN insanity :
There may be a link between madness and creativity.
2.
crazy or stupid behaviour that could be dangerous :
It would be sheer madness to trust a man like that.
In a moment of madness she had agreed to go out with him.
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IDIOMS
see method