The word "un-changeableness" refers to the quality of being unchanging or incapable of being altered. Antonyms for this word may include flexibility, variability, and adaptability. Flexibility implies the quality of being able to bend or give way easily without breaking. Variability refers to the state of being subject to change or irregularity. Adaptability entails the ability to adjust or change to new circumstances. These words are the opposite of un-changeableness, indicating a willingness or ability to change, alter, or adjust as may be necessary. While the concept of un-changeableness may be desirable in certain situations, it is important to embrace flexibility, variability, and adaptability in many aspects of life.