I do not want to be careless about what they say.

我不想对他们所说的漠不关心。

Danny is careless about water and he often leaves water dripping in his house.

丹尼对水很粗心，他经常让水滴在他的房子里。

Don't advertise the fact you're out or away, or be careless about security.

不要宣传你外出或离开的事实，也不要粗心对待安全问题。