"Having something on the ball" is a phrase used to refer to a person who is skilled, competent, and knowledgeable in their field. However, there are several antonyms that are used to describe individuals who lack these qualities. One such term is "incompetent," which refers to a person who is unable to perform tasks effectively or efficiently. Another antonym is "clueless," which means a person who lacks understanding, knowledge, or awareness. Additionally, "inept" can describe someone who is unskilled or awkward in their actions. Finally, "unskilled" implies a lack of training, knowledge, or proficiency in a particular area. These antonyms are useful for describing individuals who do not possess the qualities of someone who has something on the ball.