When it comes to describing something as "most unsalable," there are a variety of synonyms that can be used to convey the same idea. For example, the phrase "least marketable" could be used to describe a product that has few potential buyers. Similarly, the term "unmarketable" can be used to describe a product that is difficult to sell or lacks appeal. Another possible synonym for "most unsalable" is "unwanted," which suggests that the product is not in demand. Other options include "unsellable," "nonviable," and "ineligible for sale." Ultimately, the choice of synonym will depend on the context and the specific connotations that the speaker wishes to convey.