Here are some synonyms for complacent:
* Self-satisfied
* Smug
* Contented
* Unconcerned
* Indifferent
Here are some examples of how the word "complacent" might be used:
* "The company became complacent after years of success, failing to adapt to changing market conditions."
* "He was too complacent about his health and ignored the doctor's warnings."
* "It's important not to become complacent in our pursuit of knowledge."
In essence, complacency is a state of mind where one is overly satisfied with the status quo and overlooks the need for improvement or change.