insanity
https://gyazo.com/ce160a65022b7716b81dee56f4c61538
noun
狂気, 精神錯乱, 精神病; 〘主に法〙 精神異常
e.g. he suffered from bouts of insanity
e.g. as complement : he attempted to plead insanity.
きわめて無謀なふるまい.
e.g. it might be pure insanity to take this loan
e.g. the insanities of our time.
ORIGIN