"Unvariation" refers to the lack of change or variety, and to describe this condition in different ways, people use a range of synonyms. For example, monotony implies repetitiveness, sameness and wearisome routine. Constancy refers to the quality of being unchangeable, steadfast and consistent. Uniformity refers to the state of being consistent, regular and unvarying. Tediousness is another synonym, denoting something that is tiresome, dull and unexciting. Predictability implies that something can be anticipated with certainty and is unchanging. Unchanging and invariant are also synonyms for "unvariation" which signify the state or the quality of being fixed or immutable. These are just a few of the many synonyms for this word, which can help writers express their ideas more effectively.