careless

我儿子的老师说他的作业常常相当粗心。

My son's teacher says that his work is often rather ___careless.

我儿子的老师说他作业经常粗心马虎。

My son's teacher says that his work is often ___careless and sloppy.

每天都有车祸发生，因为很多司机粗心大意。

Car accidents happen every day, because many drivers are ___careless.