Antonyms for the word "changing belief" could include words such as fixed, unwavering, steadfast, constant, and resolute. While "changing belief" suggests a shift in perspective or a modification in one's worldview, these antonyms indicate a sense of stability and firmness in one's beliefs. Someone who holds a fixed belief, for example, is unlikely to be swayed by opposing arguments or new information. A steadfast individual is committed to their beliefs, even in the face of challenges or doubt. These antonyms highlight the opposite of the concept of "changing belief," emphasizing instead the importance of conviction and consistency.