lunacy

Từ điển Oxford Advanced Learner 8th

lu·nacy [lunacy lunacies] BrE [ˈluːnəsi] NAmE [ˈluːnəsi] noun uncountable
1. behaviour that is stupid or crazy
Syn: ↑madness
•It's sheer lunacy driving in such weather.
2. (old-fashioned)mental illness
Syn: ↑madness

Word Origin:
mid 16th cent. (originally referring to intermittent insanity believed to be caused by changes of the moon): from ↑lunatic + ↑-acy.

Example Bank:
•a comedy show full of inspired lunacy

• Từ đồng nghĩa / Synonyms:
  folly, foolery, tomfoolery, craziness, indulgence, madness, insaneness