lunacy
n. C1 Advanced US //ˈɫunəsi// UK //lˈuːnəsi// lu·na·cy
n. a state of being very foolish or crazy. You use this to describe a situation that makes no sense or a person who is acting like a mad person.
n. a state of extreme foolishness or insanity; a lack of reason or logic. Often used to describe irrational behavior or policies that defy common sense.
The plan to build a bridge over the river was pure lunacy.
The sudden decision to cancel the entire season was seen as a complete lunacy by the fans and the board.
The historian argued that the war was a tragic lunacy, driven by a combination of personal grudges and a failure to understand the geopolitical landscape.
From lunatic + -cy.