fortitude

1. N-UNCOUNT If you say that someone has shown fortitude, you admire them for being brave, calm, and uncomplaining when they have experienced something unpleasant or painful. 刚毅[正式]

He suffered a long series of illnesses with tremendous dignity and fortitude. 他在病魔的长久折磨下表现出了高度的尊严和刚毅。