The word "in-variability" refers to the quality or state of being unchangeable, constant, or consistent. Its opposite, or antonym, would be variability, which refers to the quality or state of being changeable, variable, or inconsistent. Other antonyms for in-variability could include fluctuation, variation, alteration, inconsistency, mutability, fickleness, and volatility. These words convey the opposite meaning of stability and predictability, and suggest a level of uncertainty, unpredictability, or instability. By understanding the antonyms of in-variability, we can better appreciate the importance of stability and consistency in our lives and work toward achieving them.