粗心的形容词英语通常有以下几种表达方式：

careless
neglectful
irresponsible
inattentive
thoughtless

其中careless是最常用的一个形容词，它的来源是care（关心）和less（少）的合成词。

例句：

She was careless with her belongings and often lost things.
她对自己的东西很粗心，经常丢失东西。

He was neglectful of his duties and responsibipties.
他对自己的职责和义务很粗心。

The manager was irresponsible in handpng the company's finances.
经理在处理公司财务方面非常不负责任。

She was inattentive in class and didn't pay attention to the teacher.
她在课堂上粗心大意，不听老师讲课。

He was thoughtless and didn't consider the consequences of his actions.
他很粗心，不考虑自己的行为会带来的后果。