complacent
adj
~ (about sb/sth) (usu derog 通常作贬义) calmly satisfied with oneself, one´s work, etc 自满的; 自鸣得意的
a complacent smile, manner, tone of voice 自满的微笑、 姿态、 声调
We must not be complacent about our achievements; there is still a lot to be done. 我们绝不能满足於自己的成绩, 还有很多事情要做.