The English word complacent means to be satisfied. Normally it is used to mean self-satisfaction.
While technically accurate, I was a bit surprised by that definition. It often carries a negative connotation and I always thought of it as having the idea of lazy without a desire to improve the situation. According to every dictionary I read it simply means to be satisfied with your situation.
The reason I was reading the English definition is I had seen the word complacer in Spanish several times and knew it meant satisfied. That made me think that maybe I did not have a proper understanding of the English word. Then I checked the Urban Dictionary and saw that there are others who think the same as I.
Complacer in Spanish seems to be used more positively than the English complacent.