愚蠢的行为用英语怎么说？

愚蠢的行为

例句

• It is time someone pointed out to Tom the stupidity of his behavior. 该有人提醒汤姆注意其愚蠢的行为了。
• His foolish behaviour may put his whole future in jeopardy. 他愚蠢的行为可能毁了他一生的前程.
• It remains lunacy to produce yet more coal to add to power stations' stockpiles. 煤越产越多，而发电站的煤堆越来越高，这始终是愚蠢的行为。
• It was stupid, just vandalism for the hell of it. 只是为了好玩而破坏公物是很愚蠢的行为。
• ...their clownish stupidity. 他们滑稽愚蠢的行为