lunacy

noun
🔊/ˈluːnəsi/
🔊/ˈluːnəsi/
[uncountable]
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  1. behaviour that is stupid or crazy愚蠢的行为;疯狂 synonym madness
    • It's sheer lunacy driving in such weather.天气这样糟糕还开车,真是疯了。🔊🔊
    • a comedy show full of inspired lunacy充满灵感的疯狂喜剧节目
  2. (old-fashioned) mental illness精神病;精神错乱;精神失常 synonym madness
  3. Word Originmid 16th cent. (originally referring to intermittent insanity believed to be caused by changes of the moon): from lunatic + -acy.