complacent
adjective disapproving uk/kəmˈpleɪ.sənt/ us/kəmˈpleɪ.sənt/
自满的，自鸣得意的
feeling so satisfied with your own abilities or situation that you feel you do not need to try any harder
a complacent smile/attitude 自鸣得意的微笑／态度
We can't afford to become complacent about any of our products. 我们不能对自己的任何一款产品沾沾自喜。
Synonym: self-satisfied