Performing poorly is a situation that can be described in different ways. One synonym for performing poorly is 'failing.' This implies that a task was not completed successfully, and one can say that someone has 'fallen short' or 'underperformed' in their tasks. Another synonym for performing poorly is 'inefficiently.' This can be used when referring to a situation where the person did not achieve the desired results or failed to meet a certain standard. Additionally, one can describe someone as 'unsatisfactory' or 'substandard' when they do not meet the expected level of performance. Overall, when a person performs poorly, there are many ways to describe the situation, and the right word choice depends on the context of the situation.