- 1(old-fashioned) the state of having a serious mental illness synonym insanity There may be a link between madness and creativity.
- 2crazy or stupid behavior 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. see also March Madness Idioms
there is a reason for someone's behavior and it is not as strange or as stupid as it seems
there's (a) method in somebody's madnessjump to other results