The term "painted smile" is often used to refer to a smile that is forced or insincere in nature. This type of smile can be seen on someone who is trying to hide their true emotions, such as sadness or anger. There are several synonyms for this term, including "fake smile," "plastic smile," "phony smile," and "insincere smile." Other related phrases include "grin and bear it," "smiling through the pain," and "putting on a brave face." These expressions highlight the idea of presenting a false front to the outside world, while the person may be experiencing inner turmoil or discomfort.