Invendible is a word used to describe something that cannot be sold or is difficult to sell. There are several synonyms for invendible which can be used in its place, depending on the context. Some synonyms include unsellable, unmarketable, undesirable, worthless, noncommercial, and unprofitable. Each of these words describes a certain aspect of invendible, such as low demand, poor quality or simply having no value in the market. Using these synonyms can help to further clarify the meaning and context of a statement and make it more specific so that the exact nature of the difficulty in selling is clear.