foolhardy/ˈfu:lhɑ:dɪ; `fulˌhɑrdɪ/ adj(-ier, -iest) foolishly bold or rash; reckless 胆大妄为的; 有勇无谋的; 鲁莽的 It was foolhardy (of him) to go swimming alone. （他）独自一人去游泳真是鲁莽.
牛津英汉双解词典