complacent

获得升职后，他开始自满，不再像以前那样努力工作。

After getting promoted, he became ___complacent and stopped working as hard as before.

多年没有遭遇大风暴，这座城市对防洪准备工作已经变得麻痹大意。

The city had grown ___complacent about flood preparedness after years without a major storm.

许多选民对公民自由变得漠不关心，想当然地认为这些权利会永远受到保护。

Many voters have become ___complacent about civil liberties, assuming they will always be protected.