The judge described the incident as an act of folly. 法官把这一事件描述为愚蠢的行为。

it is folly to do sth It is absolute folly to go mountain climbing without the proper equipment. 不带上合适的设备就去登山绝对是愚蠢的。

the folly of (doing) sth She soon realized the folly of her actions. 她很快就意识到自己行为的荒唐。

I pointed out the folly of overspending on that scale. 我指出那样大规模超支是多么愚蠢。