What does "ineffective" suggest about someone's performance?

The term "ineffective" indicates that someone is not able to produce the desired results or outcomes in their performance. When we describe someone's performance as ineffective, it suggests that their efforts are not yielding success or achieving the intended goals. This aligns with the choice that denotes being unsuccessful, as it captures the essence of failing to meet expectations or to influence outcomes positively. Other terms like "skilled," "productive," or "efficient" convey a sense of competency or success, which contrasts with the meaning of ineffectiveness. Thus, identifying "unsuccessful" as the correct interpretation reflects a clear understanding of what it means to perform ineffectively.