remiss

/rɪˈmɪs/📚 26075GREsat
If someone is remiss, they are careless about doing things that ought to be done. 懈怠的; 疏忽的

adjective [原级]疏忽的,懈怠的;玩忽职守的,不负责任的;粗心的

I would be remiss if I did not do something about it.
如果我对此不做点儿什么,就是懈怠。

re(一再) + miss(放) → 一再放掉 → 疏忽的
单词造句:
网友用“Remiss”造句精选
She had clearly been remiss in her duty. 她在工作中显然马马虎虎。
It was remiss of them not to inform us of these changes sooner. 他们粗心大意,没有早一些通知我们这些变化。