The word "unnecessity" indicates the state of being unnecessary or not needed. There are various synonyms for this word that can be used in different contexts. Some of the common synonyms for unnecessity include insignificance, irrelevance, expendability, redundancy, and superfluity. Insignificance refers to something that is minor or unimportant, while irrelevance indicates that something has no relevance or connection. Expendability suggests that something can be done away with without any significant impact, while the term redundancy is used to refer to something that is repetitive or unnecessary. Superfluity, on the other hand, refers to something that is excessive or unnecessary. These different synonyms help to add variety when expressing the concept of something being unnecessary.