1 careful (of/with sth);careful (to do sth) thinking about what you are doing so that you do not have an accident or make mistakes, etc 小心: Be careful ! There's a car coming. 小心，有车开过来了！Please be very careful of the traffic. 请千万要当心来往车辆。Be careful with that knife -- it's very sharp. 那把刀子很锋利，当心点呀。That ladder doesn't look very safe. Be careful you don't fall. 那把梯子看来不很安全，小心别摔倒。I was careful not to say anything about the money. 我把话说得很小心，跟那笔钱有关的都绝口不提。a careful driver 小心开车的司机

2 giving a lot of attention to details to be sure sth is right 细心: I'll need to give this matter some careful thought. 我要把这个问题仔细想一想。a careful worker 细心的工人 ➔carefully /ˈkeəfəli ||; ˈkɛrfəlɪ/ adv Please listen carefully. It's important that you remember all this. 请留心听，你得记住这些事情。