名詞 lunacy:

1. obsolete terms for legal insanity
   同義詞：madness, insaneness
2. foolish or senseless behavior
   同義詞：folly, foolery, tomfoolery, craziness, indulgence

1. It's sheer lunacy driving in this weather.
   天氣這麼壞還開車，簡(jiǎn)直是瘋了。

lu.na.cy

n.（名詞）
【復(fù)數(shù)】 lu.na.cies
Insanity, especially insanity relieved intermittently by periods of clear-mindedness.See Synonyms at insanity
精神錯(cuò)亂：精神錯(cuò)亂，尤其是有清醒的時(shí)間間歇參見(jiàn) insanity

Great or wild foolishness.
極度的愚蠢：很愚蠢或極端的笨
A wildly foolish act.
極端愚蠢之行為：極端愚蠢的行為
Archaic Intermittent mental derangement associated with the changing phases of the moon.
【古語(yǔ)】 月汐性精神錯(cuò)亂：與月亮的變化周期有關(guān)的間歇性的精神錯(cuò)亂

來(lái)源：
From lunatic
源自 lunatic