lunacy
noun/ˈluːnəsi/
/ˈluːnəsi/
[uncountable]- behaviour that is stupid or crazy synonym madness
- It's sheer lunacy driving in such weather.
- a comedy show full of inspired lunacy
- (old-fashioned, often offensive) mental illness The use of lunacy with this meaning can now be offensive. synonym madness
Word Originmid 16th cent. (originally referring to intermittent insanity believed to be caused by changes of the moon): from lunatic + -acy.
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lunacy