In Chinese culture, 坚定 is a highly praised virtue. It is associated with moral integrity, loyalty, and strength of character. It goes beyond simple stubbornness and implies that one's firmness is rooted in a correct, righteous, or noble principle. Historical figures, revolutionary heroes, and respected leaders are often described as having a 坚定 will (坚定的意志). A useful Western comparison is the difference between being “principled” and being “stubborn.”
Therefore, to be described as 坚定 is a compliment, suggesting that you have the inner fortitude to stand by your values, even in the face of adversity. This aligns with Confucian ideals of maintaining one's principles and moral compass regardless of the situation.
坚定 is a powerful word used in both formal and serious personal contexts.