madness

noun

1. the state of being mad; insanity.
2. senseless folly: It is sheer madness to speak as you do.
3. frenzy; rage.
4. intense excitement or enthusiasm.

noun

1. insanity; lunacy
2. extreme anger, excitement, or foolishness
3. a nontechnical word for rabies

n.late 14c., “insanity, dementia; rash or irrational conduct,” from mad (adj.) + -ness. Sense of “foolishness” is from early 15c. n.

1. The quality or condition of being insane.

see method in one’s madness.