careless

/ˈkɛrlɛs/

marked by lack of attention or consideration or forethought or thoroughness; not careful

中文释义：粗心的；疏忽的

A careless mistake in the calculation led to a huge financial loss.

计算中的一个粗心错误导致了巨大的财务损失。

He is often careless with his belongings, losing his keys frequently.

他经常对自己的物品粗心大意，频繁丢失钥匙。