The word "un-fixednesses" is a mouthful, but its meaning is simple: the quality of being variable or not consistent. Some synonyms for this word include instability, inconstancy, volatility, fluctuation, and variability. All of these words describe a lack of firmness or consistency, whether it's in a person's mood, a financial market, or a natural phenomenon. These synonyms convey the idea that something is subject to change or unpredictable, and can be used to describe many different situations. If you're looking for a more concise way to describe the concept of "un-fixedness," using one of these synonyms would be a good place to start.