foolhardy

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

When he tested an early vaccine on himself, some described the act as foolhardy. 當他在自己身上試驗還處于初級階段的疫苗時，有些人說他的行為是莽撞的。