The antonyms for the word "un-changing" refer to concepts of movement, transformation, and evolution. The opposite of unchanging is "changing" itself, meaning that something is dynamic, fluid and full of potential. Other antonyms might include "developing", "evolving", "progressing", "growing" or "transforming". These words suggest that there is a process of improvement or alteration occurring, and that things are not static but rather in a state of movement. Antonyms for unchanging can be useful in describing an environment, people or situations that are in transition and constantly evolving, rather than remaining stagnant.