正是他随意把东西扔在地板上的粗心让我恼火。

It's the ___carelessness with which he just throws stuff on the floor that annoys me.

请原谅我的粗心。

Please forgive my ___carelessness.

她在工作中的粗心导致了一个代价高昂的错误。

Her ___carelessness at work resulted in a costly mistake.