foolhardy

1. ADJ If you describe behaviour as foolhardy, you disapprove of it because it is extremely risky. 莽撞的[表不满]

When he tested an early vaccine on himself, some described the act as foolhardy. 当他在自己身上试验还处于初级阶段的疫苗时，有些人说他的行为是莽撞的。