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. 剛毅[正式]

He suffered a long series of illnesses with tremendous dignity and fortitude. 他在病魔的長久折磨下表現出了高度的尊嚴和剛毅。