The word "unpurposeful" refers to something that lacks direction or clear intent. Its antonyms, on the other hand, are words that describe the opposite - meaning something that is intentional, deliberate, and has a specific goal in mind. These antonyms include words such as purposeful, intentional, deliberate, goal-oriented, definite, planned, and decided. When we use these antonyms, we imply that a particular action or behavior is driven by a clear objective or aim. By using antonyms for "unpurposeful," we can express the idea of having a sense of direction and motivation, and the desire to achieve a specific outcome.