Antonyms for the phrase "changes one's mind" include terms such as "firm," "decisive," and "resolved." These words signal a sense of strength and determination that are the opposite of changing one's opinions or decisions. Other antonyms include "rigid," "inflexible," and "unwavering," which suggest a lack of willingness to adapt or consider alternative viewpoints. While some may view changing one's mind as weak or indecisive, it can also indicate an openness to new information and a willingness to learn and grow. Ultimately, whether one changes their mind or not, the most important thing is to approach decision-making with an open and thoughtful mindset.