Non-starter is a term commonly used to describe an idea or plan that is doomed to fail or has no chance of success. However, there are several synonyms that can be used in place of this phrase. One such term is "dead end," which refers to a situation where there is no further progress that can be made. Another term is "non-starter proposal," which can describe an idea that is not well thought out or lacks feasibility. Other synonyms for non-starter include "nonviable," "unworkable," "impossible," and "unfeasible." Each of these words can be used to describe a situation where something is not likely to succeed.