The antonym for the term "filled bill" is "failed to meet expectations." It means that the predicted or anticipated outcome did not happen or fall short of what was required or hoped for. It also implies that the particular need, want or expectation was not fulfilled or satisfied. To fill a bill indicates that something has met a specific or expected criteria, so the opposite of it, failing to fill a bill, shows that something did not meet those criteria or failed to deliver what was promised. Thus, understanding the antonyms for the term "filled bill" is essential as it can help prevent disappointment and set more accurate expectations.