Seldomness is a word used to describe something that occurs infrequently or rarely. Other synonyms for seldomness include rareness, infrequency, scarcity, irregularity, and sparsity. These words can be used in various contexts, such as when describing the appearance of a particular animal, the occurrence of a natural phenomenon, or the frequency of a behavior or action. It is important to use the appropriate synonym depending on the context of the sentence in order to convey the intended meaning accurately. Whether it's describing the scarcity of a resource or the irregularity of an event, there are plenty of synonyms for seldomness to choose from and add depth and variety to your writing.