The crossword solution for the term 'REALLY LOUSY IDEA' is NONSTARTER, which is a 10-letter word. A nonstarter is an idea or plan that is not likely to succeed or be accepted. It is usually used to describe a proposal or suggestion that is not feasible or practical. Therefore, the term 'REALLY LOUSY IDEA' can be used to describe a plan or suggestion that is not likely to be successful and is not worth pursuing.