the quality of being able to endure or tolerate pain or hardship without showing it outwardly or complaining, or the quality of generally appearing indifferent and not showing one's feelings;
e.g. They admired her stoicism and composure in difficult circumstances.
(noun)
an ancient Greek philosophy whose main tenets include that virtue is based on knowledge and that wise people are indifferent to pain, pleasure, and the changeability of fortune;
e.g. He is one of the leading scholars of stoicism at the university.