A feminine noun found only in the plural and exclusively in Ecclesiastes, where the Preacher sets out to examine wisdom alongside its opposite. The word captures not mere silliness but a deeper derangement of moral reasoning — the kind of folly that the wise person investigates precisely in order to reject. Spanish 'locura' and German 'Wahnsinn' both preserve the intensity: this is not ignorance but a willful departure from sense. In Eccl 9:3 it is paired with evil itself, revealing how the author sees madness as a spiritual and ethical condition, not merely a psychological one.