Grimalkin is a term that refers to an old female cat, typically black in color. However, there are many synonyms that can be used to describe this feline. Some of the most common one are "hag," "witch," "crone," "beldam," and "caitiff." These words all suggest a certain degree of age and a somewhat unpleasant appearance. Other synonyms for grimalkin include terms like "tabby," "tom," and "queen," which are more general descriptors for cats of varying ages and genders. Regardless of the exact synonym used, though, it's clear that the term grimalkin evokes a certain kind of mood or feeling, one that is often associated with witches, magic, and the supernatural.