adj.<贬>莽撞的，有勇无谋的
It was foolhardy to have refused.
拒绝是极不明智的。
It would be foolhardy to sail in weather like this.
这种天气出航就是瞎冒险。
He paid for the foolhardy act with his life.
他为鲁莽的举动付出了生命的代价.