If someone is rash or does rash things, they act without thinking carefully first, and therefore make mistakes or behave foolishly. 轻率的
noun [具体名词]皮疹,疹子;一连串(不愉快的事)
A rash is an area of red spots that appears on your skin when you are ill or have a bad reaction to something that you have eaten or touched. 疹子 Her face broke out in a rash. 她脸上突然长出一片红疹。
adjective [原级]轻率的,鲁莽的
It would be rash to rely on such evidence. 依靠这样的证据太轻率了。